Congress shall have power to make all laws which shall be necessary and proper for carrying into execution the foregoing powers this section of the constitution is used to
a protect states rights
b start the amendment process
c limit the authority given to congress
d justify a loose interpretation of the constitution

Correct  D. justify a loose interpretation of the Constitution.

The quoted lines are often referred to as the "necessary and proper" clause of the United States Constitution, which asserts that Congress has implied powers beyond the specifically stated ones in the Constitution..  After enumerating a number of the powers of Congress, including borrowing money, coining money, regulating commerce, etc, Section 8 of Article I of the Constitution closes by saying Congress shall have power "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."  That's a quite broad and sweeping statement, which goes beyond specifically delegated powers and gives Congress additional implied powers.    Those who favor a loose interpretation of the Constitution have focused on this phrase in the document.

An example of the implementation of "loose interpretation" of the Constitution and implementation of implied powers  occurred when Alexander Hamilton, as our nation's first Secretary of the Treasury, argued in favor of establishing a national bank.  Hamilton, as a "loose constructionist," believed that anything that is not strictly forbidden in the Constitution is allowable.  A national bank was not strictly listed as something Congress could establish, but there was nothing in the Constitution to prohibit it.  And the "necessary and proper" clause gave leeway to create it, by the implied powers given to Congress.

food chain i would say only because there is competition on getting food and survival