Q. If U = {1, 2, 3, . . . 20 } and S = set of prime numbers , then S =

• (A) { 3, 5, 7, 11, 13, 17 }
• (B) { 2, 3, 5, 7, 11, 13, 17, 19 }
• (C) {1, 3, 5, 7, 9, 11, 13, 15, 17, 19 }
• (D) {1, 2, 3, 5, 7, 11, 13, 17 }