Why Is the Language in the Necessary and Expedient Clause

Why is the language in the necessary and expedient clause in the Constitution important when thinking about the relationship between Congress and the presidency?

A) It increases tension between the two branches because it authorizes the president to propose legislation to Congress.
B) It decreases tension between the two branches because it provides an opportunity for the president to work with members of the opposition party on the budget.
C) It provides an opportunity for Congress to reassert its dominance in the struggle between the two branches of government.
D) It increases congressional influence in the sphere of foreign policy.
E) It strengthens and clarifies the separation of powers principle between the two branches of government.