The spectacle, _____ John found extremely boring, reminded me of my childhood in the countryside.
Which of the following pronouns correctly completes the sentence above?

Question

Quizplus · Accepted Answer

The words "which" and "that" can be used as relative pronouns, and follow these rules:
Which is used with a clause that does not provide essential meaning. This means that if it were to be removed, it would not change the essential meaning of the sentence. In this example, the fact that John found the spectacle boring could be removed without changing the essential meaning of the sentence, which is that the spectacle reminded the speaker of his childhood. 
That is used in a clause that is essential to the meaning of a sentence. This means that if the clause were removed, it would change the essential meaning of the sentence. For example, "The cat that scratched my mother is no longer allowed outside." Removing "that scratched my mother" is necessary to understand the full situation and could not be removed without changing the meaning of the sentence.
Hint: "which" is used in clauses that are typically offset by commas, whereas clauses that use "that" do not use commas. 
Whom should be used to refer to the object of a verb or preposition, which means they are being affected directly or indirectly by the action in the sentence.
Who should be used to refer to the subject of a sentence.

The Spectacle, _____ John Found Extremely Boring, Reminded Me of My