If Set R is set of even numbers less than 10 and Set S is a set of prime numbers less than or equal to 15, what is R U S

A.{ 2, 3, 4, 5, 6, 7, 8, 11, 15}
B.{2, 4, 6, 8, 11, 15}
C.{0, 2, 3, 4, 5, 6, 7,8, 11, 15}
D.{0, 2, 2, 3, 4, 5, 6, 7, 8, 11, 15}​