Answer:
d. the rate at which a person is willing to give up bags of fries to get more burgers while staying on the same indifference curve
Step-by-step explanation:
Marginal rate of substitution is defined as they way an individual nos willing to let go of one good in preference for another one while sustaining a particular level of utility or indifference curve.
An indifference curve is made up of different combinations of two products that a consumer's views as having the same value.
In the give scenario marginal rate of substitution measures the willingness of the individual to give up fries for burgers while maintaining a level of satisfaction