Which BEST describes how a parliamentary democracy is different from a presidential democracy?

A.
In a presidential democracy, there are usually two main political parties; in the parliamentary system there is only one.

B.
In a parliamentary democracy there are usually two main political parties; in the presidential system there is only one.

C.
In a parliamentary democracy, the head of the government is elected by the legislature.

D.
In a presidential democracy, the head of the government is elected by the legislature.

C)In a parliamentary democracy, the head of the government is elected by the legislature.

Explanation:

The main difference between presidential and parliamentary governmental systems is that in a parliamentary system the chief executive is chosen by the legistrature. but best describes how a parliamentary democracy differs from a presidential democracy is that the head of the government is a member of legislature.

the answer is false.

necessary and proper clause. the congress shall have power to all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this constitution in the government of the united states, or in any department or officer thereof.