In 1940, america leased fifty obsolete to great britain in exchange for naval bases.

airplanes

tanks

submarines

army bases

destroyers

Option D.

Explanation:

Destroyers, is the right answer.

On 2nd September 1940, Theodore Roosevelt approved a “Destroyers for Bases” arrangement. The terms of the contract, the U.S. supplied the British more than 50 antiquated destroyers, in replacement for 99 years charters to the region in the Caribbean and the Newfoundland which would be practiced as United States' air and naval headquarters. Winston Churchill, the P.M of Britain had incipiently beseeched that Roosevelt presented the destroyers as a gift, but the President perceived that the citizen and Congress of the United States would reject such a deal.

necessary and proper clause. the congress shall have power to all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this constitution in the government of the united states, or in any department or officer thereof.