为什么不选b，这个的问题具体意思是什么？我看答案解析有包含答案B

NO.PZ2022120701000005问题如下 Whiof the following statements regarng externalities is most accurate?A.Externalities ce to environmentor socifactors.B.When externalities are positive, private costs are lower thsocietcosts.C.Internalization of externalities es not affecompanies’ financial Externalities coccur e to environmentfactors, supollution or socifactors, for example, when companies fail to pa minimum wage. When externalities are negative, private costs are lower thsocietcosts. Internalization of these externalities coulsignificantly impathe costs anprofits of companies’ procts anservices, affecting their bottom line. 老师，您好，正的外部性我理解应该是私人获得的好处小于外界获得的好处？请您再确认下

NO.PZ2022120701000005问题如下Whiof the following statements regarng externalities is most accurate?A.Externalities ce to environmentor socifactors.B.When externalities are positive, private costs are lower thsocietcosts.C.Internalization of externalities es not affecompanies’ financial Externalities coccur e to environmentfactors, supollution or socifactors, for example, when companies fail to pa minimum wage. When externalities are negative, private costs are lower thsocietcosts. Internalization of these externalities coulsignificantly impathe costs anprofits of companies’ procts anservices, affecting their bottom line. 因为外部性（无论正负）都是在衡量社会和个人，所以，financi一定会受影响 是吧？

NO.PZ2022120701000005问题如下 Whiof the following statements regarng externalities is most accurate?A.Externalities ce to environmentor socifactors.B.When externalities are positive, private costs are lower thsocietcosts.C.Internalization of externalities es not affecompanies’ financial Externalities coccur e to environmentfactors, supollution or socifactors, for example, when companies fail to pa minimum wage. When externalities are negative, private costs are lower thsocietcosts. Internalization of these externalities coulsignificantly impathe costs anprofits of companies’ procts anservices, affecting their bottom line. 请一下什么叫内化外部性？没理解。是指公司的活动产生的外部性会显著影响公司财务指标么？

NO.PZ2022120701000005问题如下Whiof the following statements regarng externalities is most accurate?A.Externalities ce to environmentor socifactors.B.When externalities are positive, private costs are lower thsocietcosts.C.Internalization of externalities es not affecompanies’ financial Externalities coccur e to environmentfactors, supollution or socifactors, for example, when companies fail to pa minimum wage. When externalities are negative, private costs are lower thsocietcosts. Internalization of these externalities coulsignificantly impathe costs anprofits of companies’ procts anservices, affecting their bottom line. 我们可以说当外部性为负时，发生了外部成本，但如何证明外部成本一定大于内部成本呢？

NO.PZ2022120701000005问题如下 Whiof the following statements regarng externalities is most accurate?A.Externalities ce to environmentor socifactors.B.When externalities are positive, private costs are lower thsocietcosts.C.Internalization of externalities es not affecompanies’ financial Externalities coccur e to environmentfactors, supollution or socifactors, for example, when companies fail to pa minimum wage. When externalities are negative, private costs are lower thsocietcosts. Internalization of these externalities coulsignificantly impathe costs anprofits of companies’ procts anservices, affecting their bottom line. 请把问题和解析都翻译一下，谢谢。