Which is a procedure that enables voters to reject a measure adopted by the legislature?

Referendum

Explanation:

Referendum is defined as the universal voting mechanism that includes  all electorate members to vote for any particular subject.This voting mechanism providing direct conclusion on a proposal which forms a new law.

The political subject or proposal is raised by legislative department for reviving conclusion .Direct voting can reject or accept the question proposed through legislature.

a: social security and social programs

the answer is: c. c.it limited the president’s power to start wars.

the war powers resolution of 1973 requires the president to notify the congress whenever the president wanted to order a military operation to other countries within 48 hours. if after being reviewed the congress disagree with the proposal, that the president will be banned from ordering the operation.