What is the cause, and what needs to be brought?!
<span>The sentence written correctly looks like:
Row five miles down the river; be careful in the shallow areas.
</span>
That is because "Row five miles down the river" and "be careful in the shallow areas" are both independent phrases.
They can be joined together by either a period, or a semicolon. You can also join it using a comma and a conjunction.
The correct answer is B. river<span>.</span>
I’m pretty sure A if not then I’m dumb star:).