PT 33 S1 Q23

An air traveler in Beijing cannot fly to Lhasa without first flying to ... ...

The pattern of reasoning exhibited by the argument above is most similar to that exhibited by which one of the following?
(A) A doctor cannot prescribe porozine for a patient without first prescribing anthroxine for that patient. Unfortunately, anthroxine makes most patients who take it feel either extremely drowsy or else extremely nervous. It is likely, therefore, that a patient who has taken porozine has felt extremely nervous.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Parallel Structure: Intro Set