Another way to solve this question :

We know that 18 = 2 *3^2.

Hence, we need to find total number of 3s in 18! ( As out of 3 and 2 , we will have count of 3 least)

No. of 3s = 18/3 =

6/3 =

2.

Add the numbers in Bold, you will get total number of 3s = 8.

Hence, total number of 3^2 = 8/2 = 4.

Hence, answer is 4. D

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