can you please help with this graphing problem

Question

Which is an example of a directly proportional relationship with a constant of variation equal to 25?

1. Selected:a. 
2. 
3. This answer is incorrect.
4. b. 
5. 
6. c. 
7. 
8. d. 
9. 

Answer 1

When 2 variables are directly related the function would be in the form y =kx

You are told that the constant of variation is 25 so equation is y= 25x.so you are looking for a graph with a slope of 25 which is c