Concept:A rightward shift in the budget line means the consumer can now afford larger quantities of goods.
Explanation:The budget line shows all combinations of two goods a consumer can buy with a given income.
When income rises, the consumer has more purchasing power.
This allows them to buy more of both goods at the same prices.
As a result, the budget line shifts outward, or to the right, from its original position.
A fall in income would shift it leftward, not rightward.
A change in taste does not directly shift the budget line.
Therefore, the cause is an increase in the consumer's income.
Answer:D. rise in the consumer income