Answer:
-1 * 2 * -3 * -4 * 5
Explanation:
When multiplying negative numbers, two negatives cancel to make a positive. So if the expression as an even number of negative signs, its value will be positive. If the expression has an odd number of negative signs, its value will be negative. The expression above has 3 negatives, all the other expressions have 2 negatives, resulting in a positive value.