The current share price of Firm E is S. B is the cost of a butterfly spread whose two long calls have strikes K 1 and K 2 ( K 2 > K 1 ) and maturity T. The underlying value of the butterfly spread is the stock of Firm E. Which one of the following relationships is true for any value of K 1 and K 2 ? A - 0 < B < K 1 + K 2 2 B - K 1 S < B < 0 C - 0 < B < S K 1 + K 2 2 D - B < 0 Group of answer choices C B D A