Which expression is equivalent to 1/4 - 3/4 x?

the functions have the same rate of change i think. i narrowed it down to this answer and "the rate of change of tour 1 is greater" but i got it wrong using that answer so im assuming its the answer above. (this is a question i also answered from the iready site if anyone needs a reference)

if you're trying to figure out how much each ounce cost it would be 0.20

cents each ounce