If one number is selected at random from set A, and one number is selected at random from set B, what is the probability

Source: Magoosh

A: {71, 73, 79, 83, 87}
B: {57, 59, 61, 67}

If one number is selected at random from set A, and one number is selected at random from set B, what is the probability that both numbers are prime?

A. $\dfrac{9}{20}$

B. $\dfrac{3}{5}$

C. $\dfrac{3}{4}$

D. $\dfrac{4}{5}$

E. $1$

The OA is B

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