Jason is trying to prove that this quadrilateral is a rhombus. using the slope formula, he finds that opposite sides of the polygon are parallel. since all of the sides appear to be congruent, jason concludes that abcd is a rhombus. is jason's reasoning correct? why or why not? a) correct; jason can tell by looking at the graph that all sides are congruent. b) correct; a rhombus has two pairs of parallel sides which may or may not be congruent. c) incorrect; jason must also prove that all sides are congruent by using the distance formula. d) incorrect; a rhombus does not have two pairs of parallel sides. jason must prove that all sides are congruent.