An American Call option expiring 6 months from now on a certain stock has a strike price of $100 and the premium paid for the call was $15. Today, the stock price rose to $120 per share. Please mark the only incorrect statement about the call option.

a. It is always better for the holder of a call to exercise it as soon as it is in the money

b. If the investor were to exercise the call today, its profit would amount to $5

c. If the investor were to exercise the call today, its holding period return would be 33.3%

d. Although the call is in the money, it may be more valuable for the investor not to exercise the call early