Which statement is true about the graphs shown?

Responses
A Only graph A represents a proportional relationship.Only graph A represents a proportional relationship.
B Only graph B represents a proportional relationship.Only graph B represents a proportional relationship.
C Graph A and graph B both represent a proportional relationship.Graph A and graph B both represent a proportional relationship.
D Graph A and graph B both represent a non-proportional relationship.Graph A and graph B both represent a non-proportional relationship.