Final answer:
William B. Travis wrote the letter to convey important information about the critical situation at the Alamo and to persuade others to provide reinforcements and support.
Step-by-step explanation:
William B. Travis's letter, known as "The Travis Letter," was written during the Battle of the Alamo with the intent to convey important information and to persuade. In the letter, Travis appeals for reinforcements and support, emphasizing the dire situation faced by his forces. He states the strength and determination of his men, despite overwhelming odds, and their resolve to resist their attackers to the last. It's a plea for help as well as a call to arms, intended to draw attention to the Texans' plight and to inspire others to assist in their struggle. Given the scenario and the urgent tone of the letter, Travis's objective is not to share personal anecdotes (option a), write a fictional story (option c), or express political opinions (option d), even though a respect for their cause is implicitly political. Instead, the main purpose is to communicate the critical situation and rally support.