1. We are asked to evaluate the expression $3 \times 12 \times 0 \times 9$. 2. Multiplication is associative and commutative, so we can multiply in any order. 3. Notice there is a $0$ in the multiplication. 4. Multiplying any number by $0$ results in $0$. 5. Therefore, $3 \times 12 \times 0 \times 9 = 0$. The final answer is $0$.