A consumer buys only normal goods. What is the effect of a decrease in income on the consumer's budget line and the demand curve for a normal good? Question content area bottom Part 1 A decrease in income _______. A. decreases the slope of the budget line and creates a movement upward along the demand curve B. shifts the budget line leftward and shifts the demand curve leftward C. shifts the budget line leftward and creates a movement upward along the demand curve D. decreases the slope of the budget line and shifts the demand curve leftward