Which event best describes why does difficult to sell a home during a recession?

a. reduced income prevents buying

b. demand greatly decreases

c. mortgages become unavailable

d. housing prices increase

By definition, a recession is a temporary period in a business cycle wherein a decline in the economy is generally observed which causes the Gross Domestic Product or GDP to significantly drop. In addition, that would also yield to increase of unemployment rate decreasing the income of people.