What is an example of a restrictive adjectival clause?  

A restrictive modifying clause (or essential clause) is an adjective clause that is essential to the meaning of a sentence because it limits the thing it refers to. Because restrictive clauses are essential, they are not set off by commas. All students who do their work should pass easily.

in this passage from "animal farm", by george orwell, the statement that best explains how boxer's response supports the author's purpose in writing an allegory is option b) orwell uses boxer's decision to avoid more carnage by working hard to show how the working class was manipulated. boxer and the other animals feel they are responsible for their carnage because napoleon uses propaganda to manipulate the animals of the farm.

explanation:

a,b,d are the three sentences that use a reflexive pronoun