The correct answer is A. As I expected, she showed up late
Explanation:
In grammar, a complex sentence is a type of sentence that includes at least one independent clause (set of words that express a complete idea and do not need from any other clause) and one or more dependent clauses (set of words that need from another clause to stand). Besides this, in most cases, a complex sentence includes a subordinated conjunction for example, because, if, as, after to link the clauses. This means, from the options includes the only one that is a complex sentence is "As I expected, she showed up late" because in this there is an independent clause "she showed up late" a dependent clause "As I expected" and also the word "As" is a subordinating conjunction that is also a common element in complex sentences.
