Line m passes through points (-20, 5) and (-4,7). Line n passes through points (-5,5) and (7,4). Are lines m and n perpendicular? Explain.

A. No, the lines are not perpendicular because the product of their slopes does not equal -1.

B. No, the lines are not perpendicular because the product of their slopes equals -1.

C. Yes, the lines are perpendicular because the product of their slopes equals -1.

D. Yes, the lines are perpendicular because the product of their slopes does not equal -1.