Answer:
Option 3
Explanation:
We don't even have to multiple these numbers fully, we can just replace all of the negative numbers with -1 and all the positives with 1. (0 is neither positive nor negative, so we leave it as so) Remember, when two negatives are multiplied by each other, their negatives cancel out and the product is positive. Following PEMDAS, we would multiply each number left to right. So:
Option 1: -1 * -1 * -1 * -1 = 1
Option 2: -3 * -4 * -9 * 0 = 0
Option 3: -1 * -1 * 1 * -1 = -1
Option 4: 1 * -1 * -1 * 1 = 1
Therefore, the answer is option 3.