The 7-digit numbers 74a52b1 and 326ab4c are each multiples of 3. which of the following could be the value c?

a(1) b(2) c(3) d(5) e(8)

74A52B1 and 326AB4C are multiples of 3That means if we divide them by 3, we should get a whole number. 

Lets assume A=1 and B=1, 
So,
74A52B1 becomes 7415211

Now, lets divide it by 3.
7415211 / 3 = 2471737

Since we got a whole number as a quotient, we can safely say that A=1 and B=1.

∴ The second number 326AB4C becomes 326114C.

Now, lets assume C = 1.
So,
326114C  becomes 3261141.
Now, 
lets divide it by 3.

3261141 / 3 = 1087047

Since we got a whole number as a quotient, C = 1

∴The value of C is 1. So, answer choice A is correct.