The italicized pronoun <em>himself </em>is used as a <u>reflexive pronoun</u>, that is its type. <span>A </span>reflexive pronoun<span> is normally used when the object of a sentence is the same as the subject: I hurt myself, for example. </span>
allusion - chocolate is my Achilles heal
Analogy- school is to friends
Words that end in<span> -ch, x, s or s-like sounds, however, </span>will<span> require an -es for the </span>plural<span>: .... But note that some inconsistency is acceptable in </span>all<span> but the most formal writing: ...</span>
The answer is C. Please pay attention in SAT/ACT prep you won't believe how useful it is in the future, take it from someone who just took the SATs.
