He believed he landed in multiple places because he landed in multiple places.
This is a bit more detailed part of where he thought he landed
On August 3, 1492, Columbus set sail from Palos, Spain, with three small ships, the Santa Maria, the Pinta, and the Nina. On October 12, the expedition reached land, probably Watling Island in the Bahamas. Later that month, Columbus sighted Cuba, which he thought was mainland China, and in December the expedition landed on Hispaniola, which Columbus thought might be Japan. He established a small colony there with 39 of his men. The explorer returned to Spain with gold, spices, and “Indian” captives in March 1493 and was received with the highest honors by the Spanish court.
Off the coast of Asia
You're answer would be Asia.
d) resisting gorbachev’s reforms
answer: the answer is a. double jeopardy