On dividing 181 by a number, the quotient is 9 and the remainder is 1. Find the divisor? Choose the correct answer: A) 12 B) 15 C) 16 D) 17 E) 20

Rationale: "d = ( d - r ) / q = ( 181 - 1 ) / 9 = 180 / 9 = 20 e )"
Answer: E