Which of the Following Is Assumed Constant Along the Demand

Multiple Choice

Which of the following is assumed constant along the demand curve for gasoline?

A) the price of gasoline and the prices of related goods
B) the price of gasoline,buyers' incomes,and tastes
C) all variables affecting demand other than the price of gasoline
D) all variables affecting demand other than the supply of gasoline
E) buyers' incomes and tastes,but not the prices of related goods