Let U = {x $$\mid$$ x is a natural number $$\leq$$ 20}. Define
A = {x $$\mid$$ x $$\in$$ U and x is a prime number},
B = {x $$\mid$$ x $$\in$$ U and x is an even number},
and C = {x $$\mid$$ x $$\in$$ U and x is a multiple of 3 }. Then $$(A \cup B) \cap C$$ =

A

{3, 6, 9, 12, 18}

B

{3, 6, 9, 15, 18}

C

{2, 3, 12, 18}

D

{3, 6, 12, 18}