Final answer:
The subject of this English question is completing a sentence and the correct word to use is 'discriminate'.
Step-by-step explanation:
The subject of this question is English as it asks about completing a sentence. The correct word to complete the sentence is discriminate. In this sentence, 'it' is the subject and 'is' is the verb. The correct form of the verb to match the subject is 'discriminate,' which is the base form of the verb.
Learn more about completing a sentence in English