PLEASE BE DOUBLE SURE!!! Unlike with comment surely be given if its wrong answer

Mr. X invested equal investment in A and B shares. Standard deviation is 5% and 8% for Shares A and B respectively. While the covariance is 10%. stock may earn return of 20% if market in excellent condition and may earn only 5% if market crashes. Excellent and crash market have equal probability of being. Calculate the stock return.

Select one:

a. 7.5%

b. 25%

c. 10%

d. 12.5%