The correct answer is A. It is time to find out whether Janey chose the truck or the sedan.
Step-by-step explanation:
In the English language, the word "whether" is used to introduced options and can act as a synonym of "if". Because of this, whether is used along with the coordinating conjunction "or" that introduces the second in an option in a sentence. Additionally, this word should not be confused with the word "weather" that is related to climate.
Considering this, the sentence that uses correctly this word is " It is time to find out whether Janey chose the truck or the sedan" because in this case, the word introduces two options "Janey chose the truck or the sedan" and this includes using the word "or". On the other hand, other options are incorrect because they refer to "weather" not to "whether".