The best way to revise the sentence is " The campers rowed across the lake and set up their tent in a clearing under the trees," as stated in option D.
The sentence we are revising here consists of two independent clauses. When that happens, we need to pay attention to the following:
Thus, we can eliminate option A for using only a comma. We can eliminate options B and C because they use the semicolon in the wrong way.
The correct option is letter D, since it uses a conjunction without a comma, but no subject for the second clause.
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