求助一道关于齐全价值的题目

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2012年practice exam 第19题

Sam Seel has a small portfolio of options. Since the options are currently in-the-money, he is considering the possibility of early exercise. Which of the following statements is correct?

a.        It is never optimal to exercise European call options early.

b.        It is best to exercise a put option when it is just in-the-money.

c.        Early exercise of put options becomes more attractive when  interest rates rise.

d.        Early exercise of put options becomes more attractive when  interest rates decline.

the answer is C

如果利率上升，则股价会下跌，put option应该更值钱啊，为何要提前行权呢？

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关键词：Possibility Considering attractive Statements currently 价值

dude, u misunderstood. C says "becomes more attractive", doesn't mean u have to exercise it, it simply means comparing scenarios with interest rates r1 and r2,  if r2>r1, then Pt(r2)>Pt(r1), that's more attractive, and it's consistent with your words
如果利率上升，则股价会下跌，put option应该更值钱.
Whether u choose to early exercise or not, is another question, but it does become more attractive in that if u do exercise, u'll gain more benefit, compared to the lower interest rate case.

Ohh, your reasoning works for me, thanks!
Jst got the feeling of solving the GMAT CR question~