Which product is negative?

-2⋅ (-4) ⋅8⋅ (-1)

-7⋅ (-3) ⋅ (-5) ⋅ (-8)

-3⋅ (-4) ⋅ (-9) ⋅0

6⋅ (-2) ⋅ (-3) ⋅1

When I had these kinds of problems, I'd count how many negatives there were. If there more or less negatives to positives, then it is negative. If there's the same amount of positives and negatives, then it's positive since they cancel out! The answer to this is A. (-2) (-4) (8) (-1) = -64.