I think the answer is d). but im not certain, if anyone knows if you can solve this with the information given, that would be greatly appreciated :)

4. A small economy has only two consumers, Charlie and Doreen. Charlie's utility function is U(x, y) = x + 7y and Doreen's utility function is U(x,y) = x + 154. At a Pareto optimal allocation in which both individuals consume a positive amount of the good, how much y does Doreen consume? a. 121 b. 9 c. 22 d. Not enough information to answer this