Two relationships are described.

relationship s: karen drove 160 miles in 4 hours and then she dorve 80 miles in 2 hours.

relationship t: veron cooked 6 hamburgers in 10 min, and thenhe cooked 9 hamburgers in 15 min.

what statement is true about these relationships?

a. neither relationship is a direct variation.
b. both relationships are direct variation.
c. only relationship s is a direct variation.
d. only relationship t is a direct variation.