I think b because it covers up more space than the others. Just a guess
The answer is A, Americo Vespucci
Buchanan contended that part of Mexico is viewed as a region of Texas. Parts of Texas can be discovered way beyond the Rio Grande and despite the fact that he believes that Texas isolated themselves from Mexico, he thinks that they claim parts of each other. Summer contended opposite of Buchanan, which is that there is no piece of Texas beyond the river. He needs to get the limit line drawn and go at the earliest opportunity. Buchanan's argument was more influential on the grounds that he upheld his desire with more confirmation than Sumner.
