A study of 100 high school valedictorians who applied to Ivy League schools showed that 40 were accepted at University A, 25 were accepted at University B, and 15 were accepted at both University A and University B. What is the probability that a student was accepted at either

University A or University B?

A. 0.15

B. 0.20

C. 0.50

D. 0.60