Clause 18: To make 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. Article I, Section 8, U. S. Constitution
This Constitutional clause concerns the

A)source of increased Presidential power.
B)constitutional principle of popular sovereignty.
C)‘elastic clause’ pertaining to Congressional power.
D)‘clear and present danger’ clause of civil liberties.