On dividing 15 by a number, the quotient is 4 and the remainder is 3. Find the divisor?  Choose the correct option
A) 3
B) 6
C) 9
D) 12
E) 15

Rationale: "d = ( d - r ) / q = ( 15 - 3 ) / 4 = 12 / 4 = 3 a )"
Answer: A