What is the answer to this question:

Suppose that an increase in their income induces customers to purchase more oranges at any given price. Also suppose that an abundant orange harvest results in a lower price, causing customers to purchase more oranges. These situations are characterized respectively by a:

a ) increase in quantity demanded- decrease in demand

b ) decrease in quantity demanded-increase in demand

c ) increase in demand- increase in quantity demanded

d ) decrease in demand- increase in quantity demanded