Answer:
C) pay higher returns when interest rates rise and lower returns when interest rates fall
Step-by-step explanation:
If currently Phillip earns a lot of money when interest rates decrease, but earns very little when they increase, he should try to invest in assets that provide opposite returns, i.e. high returns when interest rates increase. That way when he isn't earning a lot of money with his business, he will at least be earning money with his investments.