A bag of n peanuts can be divided into 9 smaller bags with 6 peanuts left over. Another bag of m peanuts can be divided into 12 smaller bags with 4 peanuts left over. Which of the following is the remainder when nm is divided by 18?

A. 3

B. 5

C. 6

D. 10

E. 122

I chose n= 15 and m= 16 , so ( 15 x 16) / 18 = 40/3 . So, the reminder is 1. But the answer isn’t in the options. May someone clarifies ?

Source : GMAT CLUB