The subordinating conjunction in the above sentence is after. Thus option (D) is correct.
Subordinating conjunctions are those conjunctions or the words which connects the dependent clause with the independent clause. They typically depict a change in time or place, a cause and effect relationship, or both.
In the above sentence, conjunction used is "after" is the subordinating conjunction as independent clause we ate lunch and saved the leftover oranges and apple in a bowl is the cause of the dependent clause We cleaned up.
Thus the subordinating conjunction after is giving the reason or the logic behind the action performed. Therefore, the correct option is (D).
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