Polly consumes crackers and fruit. The price of fruit rose and the price of crackers stayed constant. The income effect on Polly’s demand is:

A．zero because Polly’s income didn’t changE．B．the change in Polly’s demand if her income is decreased by the change in the price of fruit times her old consumption of fruit．C．the change in Polly’s demand if her income is decreased by the total amount she used to spend on fruit．D．the change in Polly’s demand if her income is increased by the amount she used to spend on fruit．