How many positive integers between 1 and 300 are there such that they are multiples of 21? Choose the correct answer:
A) 14  B) 16  C) 17  D) 13  E) 15

Rationale: "multiples of 21 = 21 , 42,63 , - - - - - 294 number of multiples of 21 = > 21 * 14 = 294 answer is a"
Answer: A