Select the most appropriate option that can substitute the highlighted segment in the given sentence.
I will require a quiet room to work at.

Correct option is D

The correct substitution of the highlighted words is (d) "in."
Error identification: The phrase "to work at" is not the correct preposition when referring to needing a specific place to work. The appropriate preposition is "in."
Grammatical Rule used: The preposition "in" is commonly used to indicate being inside a place or space, which fits the context of needing a room for work.
Corrected sentence: "I will require a quiet room to work in."