Diminishing Marginal Rate of Substitution Implies That the Marginal Rate

Diminishing marginal rate of substitution implies that the marginal rate of substitution

A) Falls as one travels down (eastward) on an indifference curve
B) Rises as one travels down (eastward) on an indifference curve
C) Stays the same as one travels down (eastward) on a typical indifference curve
D) Falls as one move to higher (northeast) in the indifference curve map