Complex sentences are words and phrases that include independent and dependent clauses. As Susan entered the airport, she wondered if she was making the right decision is a complex sentence.
What are complex sentences?
Complex sentences are sentences that include both independent clause and dependent (subordinate) clause(s). These sentences include subordinating conjunctions at the starting.
Subordinating conjunctions like who, whose, at, if, while, whereas, even if, because, that, as, since, until, once, before, as soon as, etc. are used to link the two clauses.
Therefore, option D. As Susan entered the airport is an example of a complex sentence as it uses subordinating conjunctions of manner.
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