Answer: I would contend that the right answer is the E) "... since they provide fascinating evidence about the creative processes in which this great Modernist engaged."
Explanation: Just to elaborate a little bit on the answer, it can be added that the other options feature sentences that end with a preposition ("engaged in"), and although this is permissible in the English language, it is not the most formal option. In the example, a good way to correct it is to replace it by "in which." I would suggest changing the sentence so it reads "Although the author himself declared them unpublishable, the first appearance in print of 40 poems by T.S. Eliot is a significant event, since they provide fascinating evidence about the creative processes in which this great Modernist engaged."
Pretty sure the answer is B
The sentence that presents an incorrect use of hyphens is: "A thesis statement should be well-crafted and thought-over." Option B is correct.
The hyphen (‐) is a punctuation mark employed in order to join words and to separate syllables of a single word. The use of hyphens is known as hyphenation. As an orthographic concept, the hyphen is a single entity.
A hyphen is used in a compound modifier when the modifier comes before the word it’s modifying.