A sample of adults was asked their level of agreement with the statement, "The President of the United States is doing a good job of handling foreign relations." They were permitted to respond with either "strongly agree," "agree," "disagree," or "strongly disagree." How many variables were being studied?

Only One Variable is being studied in this research

Explanation:

A variable is a measurable characteristic that varies from person to persons.  

A variable can take different forms in research;  It can be majorly classified into  dependent and independent variable.

The variable being studied in the  research above is  "The President of the United States is doing a good job of handling foreign relations."   and in this research an ordinal scale of measurement is used to collect data as regards the level of agreement to the methods the president is using to handle foreign relations.  

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.