Question

President Carter tried to ease Cold War tensions when he took office in 1977 by
proposing to build more nuclear weapons.
vowing to destroy all US nuclear weapons.
negotiating the SALT I Treaty.
working with the leader of the Soviet Union

Answer 1

working with the leader of the Soviet Union

Carter sought to ease Cold War tensions by negotiating arms-control agreements with Soviet leader Leonid Brezhnev (notably SALT II, signed in 1979 though never ratified by the Senate).