Question

at the end of wwi, president woodrow wilson wanted the united states to join the league of nations. the united states senate refused to approve the versailles treaty, and therefore the united states never joined the league of nations. this refusal by the senate to approve the treaty is an example of
a rule of law
b internal relations
c checks & balances
d executive veto

Explanation:

The U.S. Constitution establishes checks and balances, where each branch of government (executive, legislative, judicial) has powers to limit the others. The Senate (legislative branch) refusing to approve a treaty supported by the President (executive branch) is an example of the legislative branch checking the executive branch’s power.

Answer:

C. Checks & Balances