Congress checks on the power of the presidency by

The president nominates federal officials, but the Senate confirms those nominations. Within the legislative branch, each house of Congress serves as a check on possible abuses of power by the other. ... In turn, Congress can override a regular presidential veto by a two-thirds vote of both houses.

Explanation:

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"choosing is refusing" means individuals face an opportunity cost with each decision they make. economists state that every decision involves trade-offs. opportunity cost is the least desirable alternative given up as a result of a decision.