Which of the following affects the Constitution by applying and interpreting legal cases?

A. the President

B. the courts

C. Congress

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D. political parties

B.

Explanation:

The Courts were set up by the Constitution to interpret laws, compared to the enforcement of laws (Executive Branch) and creation of laws (Congress/Legislative Branch). Political parties are not involved in the interpretation of legal cases, although judges may have ideologies reflecting a certain party's beliefs or be a part of the party itself.

Answer: B - The Courts

Explanation:

Courts always handle legal cases.