Explanation:

- Option 1: Divisibility by 3

To check if a number is divisible by 3, sum up its digits. If the result is divisible by 3, then the number is too.

For 2918245: 2 + 9 + 1 + 8 + 2 + 4 + 5 = 31, which isn't divisible by 3.

- Option 2: Divisibility by 11

For divisibility by 11, alternate summing the digits and find the difference.

For 2918245: (2 + 1 + 2 + 5) - (9 + 8 + 4) = 10 - 21 = -11, which is divisible by 11.

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- Option 3: Divisibility by 12

A number must be divisible by both 3 and 4 to be divisible by 12.

Since 2918245 isn't divisible by 3, it's not divisible by 12.

- Option 4: Divisibility by 9

If the sum of digits (31) is not divisible by 9, the number isn't either.