What was the question for this implicit rationale, and corresponding answer?
Riding the subway together does not imply two men are coworkers.
 The answer: it is not possible to tell
The question: Given the sentence "The backs of the heads of two men that are plugging their ears while riding the subway." can we conclude that "The two men riding the subway are coworkers."?
Options:
- yes
- it is not possible to tell
- no