The right option is; A
It is time to find out whether Janey chose the truck or the sedan is the sentence that uses whether correctly.
‘Whether’ is a word used to express doubts and in introducing questions that have multiple alternative possibilities. ‘Whether’ can be confused with ‘weather’ which is the atmospheric condition at a specific time and area and it includes humidity, temperature, cloudiness, wind, precipitation, rain, dryness, and sunshine.