95.With all other things being equal,a risk monitoring system that assumes constant volatility for equity returns will understate the implied volatility for which of the following positions by the largest amout:
a.short position in an at-the-money call
b.long position in an at-the-money call
c.short position in a deep in-the-money call
d.long position in a deep in-the-money call

answer:D

想知道为什么不选C啊，thanks！