Explanation:

- To find N, we need to ensure that 46N is divisible by 18, meaning it should leave a remainder of 0 when divided by 18.

- First, check divisibility: a number is divisible by 18 if it's divisible by both 2 and 9.

- For divisibility by 2, the last number N should be even.

- For divisibility by 9, the sum of the digits should be a multiple of 9.

- If N = 8, 46N becomes 468.

- The sum of 468's digits is 18 (4 + 6 + 8 = 18), divisible by 9.

- 468 ends in 8, an even number divisible by 2.

Thus, 468 is divisible by 18.

Your Option: 4- 8 is correct.

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