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Form, Structure, and Sense SAT question

Reading and Writing · Standard English Conventions · Easy · Answer it here, explanation included.

Scientists believe that, unlike most other species of barnacle, turtle barnacles (Chelonibia testudinari) can dissolve the cement-like secretions they use to attach blank to a sea turtle shell, enabling the barnacles to move short distances across the shell’s surface.

Which choice completes the text so that it conforms to the conventions of Standard English?

ExplanationShow

Choice B is the best answer. The convention being tested is pronoun-antecedent agreement. The plural reflexive pronoun “themselves” agrees in number with the plural antecedent “turtle barnacles,” correctly indicating what is attached to a sea turtle shell.  

Choice A is incorrect because the singular pronoun “it” doesn’t agree in number with the plural antecedent “turtle barnacles.” Choice C is incorrect because it results in an unclear and confusing sentence. In this context, it’s unclear what the plural pronoun “them” refers to. Choice D is incorrect because the singular reflexive pronoun “itself” doesn’t agree in number with the plural antecedent “turtle barnacles.”

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