The necessary and proper clause .a. has provided the basis for an expanded role of the national government. b. has greatly expanded the presidential powers. c. was in the original Constitution, but was eliminated as a consequence of the Twenty-Seventh Amendment. d. has served to limit the expansion of national authority. e. is located in the Constitution in the text of the Tenth Amendment.

A. has provided the basis for an expanded role of the national government

Explanation:

The necessary and proper clause gives the Congress power to make all the laws necessary and proper to make and execute all foregoing power and every power vested by the Constitution of the United States. Hence, it gave the Congress incidental powers and hence provided the basis for an expanded role of the national government.

answer; i believe the correct answer is prefrontal cortex;

it brings together the military and civilian sectors of society to harness the total power of the nation. it is the mechanism that facilitates the successful prosecution of any conflict.it brings together the military and civilian sectors of society to harness the total power of the nation. it is the mechanism that facilitates the successful prosecution of any conflict.