What document give only parliament the power to tax as giving consent of the whole realm

The Magna Carta was the document that gave only parliament the power to tac as giving consent of the whole realm.

it provided for selection of government employees through competitive examinations. it also made it unlawful to fire or demote covered employees for political reasons or to require them to give political service or payment, and it set up a civil service commission to enforce the law.

explanation:

c or d both can be the answer