Auditor: XYZ, a construction company, purchased 20 new trucks 3 years ago, ... ...

Auditor: XYZ, a construction company, purchased 20 new trucks 3 years ago, and there is no record of any of those trucks being sold last year. Records indicate, however, that XYZ sold off all of its diesel-powered trucks last year. We can thus conclude that none of the 20 trucks purchased
3 years ago were diesel powered.

Which one of the following is an assumption required by the auditor’s reasoning?


(A) All of the trucks that XYZ sold last year were diesel powered.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in PT71 (Dec 2013): Logical Reasoning B