(Figure: Cereal and Pancakes I) the Market Prices for Cereal

(Figure: Cereal and Pancakes I) The market prices for cereal and pancakes are $2 and $1, respectively. Pareto efficiency requires that the marginal rate of substitution of cereal for pancakes equal _____ for Elaina and _____ for Jose.

A) 2; 1/2
B) 1/2; 2
C) 2; 2
D) 2; 1