Explanation

To evaluate the expression, follow the order of operations:

Multiply 3 and 3: 3 * 3 = 9

Add 3 and 9: 3 + 9 = 12

Subtract 3 from 12: 12 - 3 = 9

Add 3 to 9: 9 + 3 = 12

The correct answer is: 12