Max Consumes Only Yoghurt and Almonds,and He Is on His

Multiple Choice

Max consumes only yoghurt and almonds,and he is on his highest possible indifference curve.Bundle A (four yoghurts and two almonds) and bundle B (three yoghurts and three almonds) are on this indifference curve.Between points A and B,what is Max's marginal rate of substitution of yoghurt for almonds?

A) 1
B) 2
C) 3
D) 1.33