While columbus is generally cited as the european who "discovered" america, thinking that he was in east asia, and it was amerigo vespucci correctly deducing that the new world was a landmass previously unknown to the europeans.a) thinking that he was in east asia, and it was amerigo vespucci correctly deducingb) he thought that he was in east asia, and it was amerigo vespucci who correctly deducedc) he thought that he was in east asia, instead of amerigo vespucci who correctly deducedd) thinking that he was in east asia, but amerigo vespucci correctly deducede) in east asia according to his thought, and amerigo vespucci correctly deduced

D) thinking that he was in East Asia, but Amerigo Vespucci correctly deduced is the correct answer.

Explanation:

Letter A is incorrect since the connector "and" brings the idea of in addition, meaning that Columbus though he was in another place, in addition it was Vespucci correctly deducing that it was a New World.

Option B is also incorrect because the gerund "thinking" is not a problem in the original sentence and in also includes the same connector as in the first one.

Letter C is incorrect because by using instead of, it could be understood that one took the other's place (that Vespucci was in Asia, in example.)

E is also incorrect because it lacks a subject and it could be a little confusing: "...who 'discovered' America, in East Asia according to his thought..."

Letter D is correct since the connector but introduces a new idea, contrasting with the first one and supporting the idea of Columbus mistake.