Answer:
5. I am writing to request that you consider sponsoring our team
Explanation:
A thesis statement indicates the main purpose of why you are writing text and helps you focus on the key points; allowing your work to remain relevant to the reader. The text shown in the above question shows a boy who wrote to propose that a company sponsor his school's basketball team. The sentence that shows the purpose of the text is sentence number 5, where the student makes clear his purpose which is "I am writing to request that you consider sponsoring our team."
