问题如下：
An oil and gas exploration and production company announces that it is offering 30 million shares to the public at $45.50 each. This transaction is most likely a sale in the:
选项：
A.futures market.
B.primary market.
C.secondary market.
解释：
B is correct.
This transaction is a sale in the primary market. It is a sale of shares from the issuer to the investor and funds flow to the issuer of the security from the purchaser.
这个题目我觉得有歧义，没有说是否是首次发行
