What grade is this question from?
Option A consists of two independent clauses, therefore there's a coordinating conjunction in between them to help the sentence flow.
Answer:
The answer would be "B"
Explanation:
B: the doctor realizes what the illness is and treats it.
Answer:
The main idea is about the narrartor's experience on their first day of a new school
hope this helped :)
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to establish setting and context</span>
