Punctuating a Compound Sentence

Easy Usage And Mechanics Punctuation

Read the following sentence carefully:

The teacher asked the students if they had completed their assignments I reminded her that I had finished mine.

Which of the following options correctly punctuates this sentence?

The teacher asked the students, if they had completed their assignments; I reminded her that I had finished mine.

The teacher asked the students if they had completed their assignments, I reminded her that I had finished mine.

The teacher asked the students if they had completed their assignments, and I reminded her that I had finished mine.

The teacher asked the students if they had completed their assignments. I reminded her that I had finished mine.

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