Answer:
D. Legislature.
Explanation:
In both Presidential and parliamentary system, a country will be headed by a president.
But, in a presidential system, the president will be directly elected by the citizens through national election.
In alimentary system on the other hand, the president ill be elected by the members of the legislative branch on the citizens' behalf . (In United States we refer to them as Congress while In Europe they're probably more known as the 'parliament')
Example of a Country that use presidential system : United States.
Example of a country that use parliamentary system : Finland.
