Macroeconomics. A. is concerned with the expansion of a small business into a large corporation. B. is narrower in scope than microeconomics. C. analyzes mergers and acquisitions between firms. D. is concerned with the expansion and contraction of the overall economy.

D. is concerned with the expansion and contraction of the overall economy.

Explanation:

Macroeconomics -

It is the sub branch of the economics , which deals with the economy as a whole complete unit , is referred to as macroeconomics .

The study includes the factors like deflation , inflation , national income , rate of economic growth , gross domestic product etc.

It includes the global economy , national as well as regional economy .

The study helps to deal with problems of economy , evaluation of any economic policies .

Hence , from the given question ,

The correct option is D.

the correct answer is:

it required the president to inform congress within forty-eight hours of any new troop commitment.

the war powers resolution (1973) is a federal law designed to limit the u.s. president’s ability to initiate or intensify military actions abroad without the approval of the congress.

it establishes that the president can send armed forces into action abroad only by declaration of war by congress, statutory authorization, or in case of a national emergency created by attack upon the united states, its territories or possessions, or its armed forces.

it requires the president to notify congress within 48 hours of sending armed forces to military action.