The sets of ordered pairs below represent the cost to fix a plumbing issue based on the number of hours. The first coordinate represents the hours and the second coordinate the cost. Select the sets of ordered pairs that are proportional relationships.
{(2,160),(4,320), (5,400), (8,640)}
O {(1,90),(3,170),(4,210). (6,290)}
O {(1,135),(4,210),(6,255), (8,290)}
{(2,150),(3,225), (7,525), (8,600)}
{(4,220),(5,275),(6,330), (7,385)}