A should Be the Correct answer.
May this be helpful!
Thank you!
Answer:
"Definition" Matches with " given an explanation of the unfamiliar word right in the sentence".
"Inference" matches with " Provides the general sense of an unfamiliar word with the main Idea of a sentence or paragraph"
"Synonym" matches with restates the unfamiliar word with another familiar word.
"Antonym" matches with contrasts the unfamiliar word with an opposite.
It kind of helps people work together, a lot of people tend to slack off more if they can't exactly work together.
Answer:
That would be called a Subordinate Clause.