You answer is B as end would be the object other than bus in your sentence.
(NOT MY WORDS TAKEN FROM A SOURCE)
The correct answer for the question that is being presented above is this one:
Discovering the intent involves the evaluation of the audience and purpose associated with the evidence. If you really want to know the purpose of the reason of a person in doing a thing, then you need to evaluate him or her.
Hope this helped!
:)
