The word that can best complete the sentence is C. They
What is a Pronoun?
This refers to the part of speech that is used in the place of a noun in a sentence to show ownership or possession.
Hence, we can see that the sentence talks about people understanding instructions and because a group of people is mentioned, then the word "they" would be best used to complete the sentence.
Read more about pronouns here:
https://brainly.com/question/1494508
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