What least value must be given to 'a' so that the number 3a4860115 is exactly divisible by 9?

Correct option is A

Given:
Number = 3a4860115
Formula Used:
A number is divisible by 9 if the sum of its digits is divisible by 9.
Solution:
Sum of digits = 3 + a + 4 + 8 + 6 + 0 + 1 + 1 + 5 = 28 + a
(28 + a) should be divisible by 9
28 + 1 = 29
28 + 2 = 30
28 + 3 = 31
28 + 4 = 32
28 + 5 = 33
28 + 6 = 34
28 + 7 = 35
28 + 8 = 36 (divisble by 9)
Hence a= 8 is the answer