Question

Which graph shows a proportional relationship?

graph A
graph B
graph C
graph D

Answer 1

Graph C, is the proportional relationship graph 

Answer 2

It would actually be Graph C since a proportional relationship also answers the question of determining the unit rate, slope of the line, and etc.

The unit rate is 5/1, and follows the rate into a slope making it proportional.
Hope I helped! ^-^