The correct answer is answer choice D, barons. Barons, or nobles, were heavily taxed by King John to fund his wars with France, which is why they revolted and forced him to sign the Magna Carta. Peasants and farmers were not taxed because they could not contribute much to the war effort, and Parliament did not yet exist when the Magna Carta was signed.
The Karachi Agreement tried to make a treaty, that was then signed in 1949 by the military representatives of India and Pakistan, which was supervised by the United Nations Commission for India and Pakistan, which ended up establishing a cease-fire line in Kashmir following the Indo-Pakistani War of 1947.