According to the Let's Compare Section, One of the Differences

According to the Let's Compare section, one of the differences between parliaments and the U.S. Congress is that members of Congress are constitutionally prohibited from holding offices in the executive branch. What are two other differences?

A) Parties are stronger in the U.S. and unified government is always guaranteed
B) Parties are weaker in the U.S. and divided government is always guaranteed
C) Parties are weaker in the U.S. and divided government is not only possible but common
D) Parties are stronger in the U.S. and divided government is possible but not common