A complex sentence has the independent and dependent clause. Choices A, B, and D have only independent clauses.
Therefore, the answer here is C.
Because it has an independent and dependent clause.
As Jake was reading the email from June yet again; DEPENDENT
<span>the flight attendant coughed gently to get his attention; INDEPENDENT</span>
It was temporarily removed for glitching but in the next update they are going to add it back I hope this helped!