Projects a and B Are Mutually Exclusive,have Positive Net Present

Multiple Choice

Projects A and B are mutually exclusive,have positive net present values and required discounted payback periods that exceed the projected discounted payback periods.Which project(s) ,if either,should the firm accept?

A) Both A and B
B) Neither A nor B
C) A,but not B
D) B,but not A
E) Either A or B but not both A and B