You need to answer this prompt and write the essay assignment. Your teacher is looking for your critical thinking skills and how well you understood the lesson not ours.
This means that the person who said it is "watching your back", and is there to support you. "Watching your back" or "Got your back" means that they are in support and there to defend you if needed.
Winston Churchill
in Britain it was Winston Churchill
offer evidence in support of the thesis statement
Hypothesis.
require support
Not if supporting your thesis statement was part of the assignment.
There is no definitive evidence to support the existence of a carman Winston story. It is possible that it could be a work of fiction or a myth rather than a true story.
It is evidence in support of a fact or statement
the thesis statement
There is no evidence to support this statement.
statement of arrears