An Individual's Demand Curve for a Good Is Derived by

An individual's demand curve for a good is derived by

A) varying the income level and observing the resulting total utility derived from both goods.
B) varying the price of one good and observing the resulting quantities of the other good.
C) shifting the budget line to the left and calculating the loss in total utility.
D) varying the price of one good and observing the resulting quantities demanded of that good.