A subordinate clause is defined as the clause that needs the independent clause because it does not convey a complete thought. Based on the given sentence above, there is no subordinate clause, since the sentence is an example of a compound sentence having two independent clause connected by the coordinating conjunction "because". Hope this answer helps.
Revision involves clarifying purpose and meaning.
All other choices would be incorrect because they are a part of the process of editing.
The prepositional phrase in the sentence given is:
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"in the refrigerator" .
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More details plss/...........................................
the answer is C: maintaining an objective tone
