PTC.S2.Q22 - One can be at home...

I am confused by this question. I selected A as the answer when drilling and during blind review. During blind review I was hesitant and wanted to select C (which is the correct answer). Clearly, I do not understand this question fully and I can sort of make sense of it on my own but would love insight and a clear explanation.

Admin Note: Edited title. Please use the format: "PT#.S#.Q# - brief description of question”