问题如下：
Which of the following about underwritten offering is most appropriate?
选项：
A. The investment bank purchases the entire issue and resells the bonds to dealers.
B. The investment bank sells the bonds but do not commit to purchase the whole issue.
C. Compared to best efforts offering, it has lower risk for investment banks.
解释：
A is correct.
If the investment bank uses underwritten offering, it will purchase the entire issue and resell the bonds to dealers. Due to the commit of whole issue, underwritten offering is more risky than best efforts offering.
C为什么对呢？没看懂