An economist for a bicycle company predicts that, other things equal, a rise in consumer incomes will increase the demand for bicycles. This prediction assumes that

A) there are many goods that are substitutes for bicycles.
B) there are many goods that are complementary to bicycles.
C) there are few goods that are substitutes for bicycles.
D) bicycles are normal goods.

The economist's prediction assumes that bicycles are normal goods, meaning that as consumer incomes rise, they will have more disposable income to spend on goods like bicycles. If bicycles were inferior goods, the opposite would be predicted, as consumers would switch to higher quality goods as their incomes rise. The existence of substitutes or complements is not relevant to this prediction, as it assumes all else is held equal.