A proportional relationship is one in which two quantities vary directly with each other. We say the variable y varies directly as x if:
y=kx
for some constant k , called the constant of proportionality .This means that as x increases, y increases and as x decreases, y decreases-and that the ratio between them always stays the same.
Here, as the ratios x/y and y/x are not folowed, through all the sets of x and y, it is not a proportional relationship.
Thus, first option is correct