Markus Is a Mortgage Broker, Who Is Paid by Commission

Markus is a mortgage broker, who is paid by commission.When interest rates decline, he does a lot of business and earns a lot of money, as more people buy houses or refinance their mortgages.But when interest rates rise, business falls substantially.To diversify, Markus should choose investments that

A) provide a higher return than the market average.
B) provide a lower return than the market average.
C) pay higher returns when interest rates rise and lower returns when interest rates fall.
D) pay lower returns when interest rates rise and higher returns when interest rates fall.