The Figure Given Below Shows the Demand Curves for Five

Multiple Choice

The figure given below shows the demand curves for five products: A, B, C, D, and E.Figure 6.1

-The income elasticity of demand _____.

A) must be negative because of the law of diminishing marginal utility
B) could be positive, negative or zero, depending on the nature of the good
C) must be positive for all goods because consumers tend to buy more at higher incomes
D) is usually zero because "you can only have so much"
E) can never be zero