Answer:
C: y decreases as x increases
Explanation:
Notice from this graph, as we move from left to right, the y values are decreasing while the x values are increasing.
This means that the relationship of the line in terms of x and y can be described as, as y decreases, x increase. Hence you will choose option C.
You can validate this by choosing to definitive points on the line, say the origin (0,0) and (2, -6). Notice that our x value increased, but our y value decreased.
Cheers.