The use of which foreign policy tool is described in the passage

Foreign policy tool is described in the passage is A. Diplomacy

Explanation:

Diplomacy is the most common tool used for negotiation in the foreign policy and is required to be an extremely essential skill for the diplomats who are often involved in such discussions.

Diplomacy is used to counter the tension between two parties by intermediaries and people who would make the middle ground in the discussion and suggest alternatives and small concessions until both parties are ready to concede enough to be agreeable to the other party and thus the deals are made.

the answer is a) the proclamation of 1763.

d) he bring down boss tweed and tammany hall.