Which Fact About the Term Structure Is the Expectations Theory

Which fact about the term structure is the Expectations Theory able to explain?

A) Why interest rates on bonds with different terms to maturity tend to move together over time
B) Why yields on short-term bonds are more volatile than yields on long-term bonds
C) Why longer-term yields tend to be higher than shorter-term yields
D) Why interest rates on bonds with different terms to maturity tend to move together over time and why yields on short-term bonds are more volatile than yields on long-term bonds