<span>The Commander of the
Texian Rebels gave Travis credibility in the letter. Travis' Alamo letter is
also known as Alamo is a letter that is pleading for help. The letter was sent
to his home finally because of Travis' credibility. </span>
The b best answer that I could see is D because it correlates to the actual question. But c also looks good because it gives a reason as why not to buy them from a shop/private owner.
Best of Luck...Nathan...L.