The question is asking you to find the slope. Slope intercept form is writen:
y = mx + b (m being the slope and b being the y-intercept)
The slope would be 5 and the y-intercept would be 0.
So, your answer would be y = 5x also known as C. y = 5x
Hope I helped! :)
Could you zoom out a little maybe? it looks like you cut off something in front of dot