Irrespective of Whether She Is at Her Optimum, Jenna's Valuation

Multiple Choice

Irrespective of whether she is at her optimum, Jenna's valuation of coffee relative to orange juice can be measured by

A) her marginal rate of substitution between coffee and orange juice.
B) the price of coffee relative to the price of orange juice.
C) the ratio of the quantity of coffee that she buys relative to the quantity of orange juice that she buys.
D) the ratio of the quantity of coffee supplied in the market to the quantity of orange juice supplied in the market.