Which One of the Following Is Correct About Security Offerings

Which one of the following is correct about security offerings?

A) One of the costs of an IPO is the abnormal return.
B) The underwriting spread tends to be a constant percentage regardless of the offering size.
C) The costs of selling equity are less than the costs of selling debt.
D) The Green Shoe option covers overallotments at the market price.
E) There are economies of scale in both equity and bond offerings.