The correct option is B 2
For a number to be divisible by 3, the sum of all the digits of the number should be divisible by 3.
The number given is 4a6.
⇒ Sum of digits = 4 + a + 6
= 10 + a
If a=0
⇒ Sum of digits = 10 + 0 = 10.
If a=1
⇒ Sum of digits = 10 + 1 = 11.
If a=2
⇒ Sum of digits = 10 + 2 = 12.
12 is divisible by 3.
Therefore, the least value of a is 2.