To answer this question, let's go through the given code step by step:

1. Data B; - This statement creates a new dataset named B.

2. X=1; - This statement assigns the value 1 to the variable X.

3. S=X*5; - This statement calculates the value of S by multiplying the value of X (which is 1) by 5. Therefore, S becomes 5.

4. Rename S=Multiply; - This statement renames the variable S to Multiply.

5. Keep Multiply; - This statement keeps only the variable Multiply in the dataset.

6. Run; - This statement executes the code.

Based on the given code, only one variable, Multiply, is kept in the dataset B. Therefore, the correct answer is D) 1.

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