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Verbal·Standard English Conventions·Boundaries

easy

Physical barriers, chemical defenses, and protein defenses are the three main categories of plant defense mechanisms. The English oak tree uses a __________ the trees produce chemicals that disrupt certain herbivorous insects’ ability to digest food.

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

A

chemical defense

B

chemical defense,

C

chemical defense;

D

chemical defense: