The sentence that would not be a good clincher sentence for an essay is "It is important to firmly establish boundaries right from the start in order to avoid conflicts with a supervisor.
What is a clincher sentence?
A clincher sentence is the sentence at the end of the essay that summarizes the main idea of the essay. Clincher sentence may reinforce the overall argument.
The clincher sentence that restate the topic of the essay seem dull and ineffective. Therefore the least suitable sentence for the thesis is the one that restates the topic of the essay that is sentence C.
Therefore the correct option is C.
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