Geometry

gary is using an indirect method to prove that segment de is not parallel to segment bc in the triangle abc shown below:

he starts with the assumption that segment de is parallel to segment bc.

which inequality will he use to contradict the assumption?

a.) 4: 10 ≠ 6: 14
b.) 4: 6 ≠ 6: 14
c.) 4: 10 ≠ 6: 8
d.) 4: 14 ≠ 6: 10