In a school, 45% of the students play football, 30% of students play cricket and 15% of students play both. If a student is selected at random what is the probability that he plays football or cricket?

A

$$\frac{1}{4}$$

B

$$\frac{2}{7}$$

C

$$\frac{3}{5}$$

D

$$\frac{4}{5}$$