(Figure: Cereal and Pancakes IV) What Is the Name of Curve

(Figure: Cereal and Pancakes IV) What is the name of curve A, and what is its significance?

A) contract curve: shows all possible Pareto-efficient allocations of pancakes and cereal between Elaina and Jose
B) contract curve: shows all possible allocations of pancakes and cereal that give Elaina and Jose equal utility
C) output curve: shows all possible combinations of pancakes and cereal that can be produced at a constant per-unit cost
D) isoprofit curve: shows all possible combinations of pancakes and cereal that give the manufacturers equal profit