It is a compound-complex sentence where there are two phrases used together and there is one dependant. Thus, option "D" is correct.
For example, because my pizza was too cold I heated it in the microwave. There the sentence given here is an example of a compound-complex sentence.
More such examples are, I waited for too long but then I decided to go alone. In compound-complex sentences, there is a dependence on which the sentence is based. The two phrases are linked together with that dependence.
Thus, option "D" is correct.
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