The correct option is
B Method of election of President/Plead of the State
The major difference between these two systems is that in a Presidential system, the executive leader, the President, is directly voted upon by the people (Or via a body elected specifically for the purpose of electing the president, and no other purpose), The President is nominal head of the state in a Parliamentary form of government. He is elected not directly by the people but members of the electoral college in accordance with the system of proportional representation by means of a single transferable vote.
In the Presidential System, it is more difficult to enact legislation, especially in the event that the President has different beliefs than the legislative body. The President only responds to the people, the legislative branch can't really do anything to threaten the President. As a result, he can make it more difficult for the legislative body to do anything.
In the Parliamentary system, if the Parliament doesn't like the Prime Minister, they can cast a vote of no confidence and replace him. This tends to make the executive leader subservient to the Parliament.