Assume that the current corporate bond yield curve is upward sloping. Under this condition, then we could be sure that Select one: 
a. The economy is not in a recession. 
b. Long-term bonds are a better buy than short-term bonds. 
c. Inflation is expected to decline in the future. 
d. Long-term interest rates are more volatile than short-term rates. 
e. Maturity risk premiums could help to explain the yield curve's upward slope.