The sentence that is written correctly with parallel structure is: In order to complete your application, you must schedule an interview, get three recommendation letters, and pay the $50 application fee. The correct answer is option B. What makes this sentence have a parallel structure is that, the verbs used are in the same grammatical form.
(I don't know if i should put it in full sentences so I'm not.)
Line 1- Home
Line 2- Safe, Secure
Line 3- still, active, loving
Line 4- windows, doors, rooms, people
Line 5- moving, playing, talking
Line 6- helpless, protective
Line 7- outside
(I tried. I would have done better if I understood how to do it better. but that's what I came up with. Hope it's good. I am a poet so yeah.)