The answer is
B. They eat and remove crop-damaging grubs.
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1.concerning the writing, study, or content of literature, especially of the kind valued for quality of form.
"the great literary works of the nineteenth century"
synonyms: written, poetic, artistic, dramatic
"literary works"
2.
(of language) associated with literary works or other formal writing; having a marked style intended to create a particular emotional effect.
synonyms: formal, written, poetic, dramatic; More
