For an index, the $930 strike 6 months call premium is $45.34 and the $950 strike 6 months call is selling for $28.78. What is the maximum profit that an investor can obtain from a strategy employing a bull spread at strike prices 930 and 950 with these two call options over 6 months? Interest rates is 0.5% per month.

$2.44 B. $2.94 C. $37.06 D. $36.56