On dividing 73 by a number, the quotient is 9 and the remainder is 1. Find the divisor?  Options.
A) 8 B) 15 C) 16 D) 17 E) 18

Rationale: "d = ( d - r ) / q = ( 73 - 1 ) / 9 = 72 / 9 = 8 a )"
Answer: A