The answer is a because you have to put your notes into your own words
<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 juxtaposition technique is used when two descriptions, ideas, characters, actions, or events are placed side by side in a narrative.
Juxtaposition is the practice of juxtaposing two items in order to emphasize their differences. It is employed rhetorically by writers. Contrasting opposites like wealth and poverty, beauty and ugliness, or darkness and light is a common technique used by writers.
In literary terms, juxtaposition refers to the display of difference by ideas arranged side by side.
The following quotes are an illustration of juxtaposition
"Ask not what your country can do for you; ask what you can do for your country," and "Let us never bargain out of fear, but let us never fear to negotiate" are two quotes that should guide all negotiations."
"The fact amply demonstrates a cultural contrast between rich and poor."
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If you are referring his defeat at the end against the dragon, that is because of his hubris. He was too proud and believed that he could do it alone without his soldiers. This brings his defeat and he realizes that he will die because of his hubris, after which Wyglaf will take over since he was the only one brave enough to help.