What is ambiguous to me is the labeling of Person A and Person B here. I'll assume that the person regarded as fastest in the world is Person A (not B, as stated at the beginning). Assuming that's the case, there is really no ambiguity here. Person A is admitting he is not as fast as he used to be. In the most literal reading of this, he doesn't actually address whether he is still THE FASTEST person in the world or not, but he is certainly not actively claiming to be.
I think it's worth generalizing to other kinds of text. To me, this is a pretty clear scenario, and only a reader who brings a specific preconceived idea to this reading would think otherwise. But often, I find that on exams, students begin to overanalyze reading passages or even simple questions and introduce confusion when the passage or question is actually pretty clear. In those situations, a good approach is to step back and consider what the simplest explanation/interpretation is. It's usually the right one.

Elizabeth D.
07/27/23
Qasim H.
That makes sense. Thanks a lot Elizabeth!07/27/23
Qasim H.
Thanks a lot for the response! You’re right that the fastest person was intended to be Person A in this scenario. Both me and my friend agree that the Person A is not as fast as he used to be. The disagreement is on whether he’s still the fastest. The argument I presented to my friend was that if you take the dialogue in its entirety, we can say that Person A is agreeing with Person B. Or at the very least he’s not disagreeing with him. Therefore, we can take this as an indirect concession from Person A within this context that he’s not the fastest anymore. Even if he didn’t directly concede that he isn’t the fastest. This is based on Person B calling him ‘slow’. My Friend’s argument was that Person A only conceded to not being as fast as he used to be. But he’s still claiming to be the fastest because he used the word ‘remain’. My friend is arguing that the use of the ‘remain’ necessitates that he’s still the fastest. Based on your response, I know you’re saying that neither me or my friend are 100% correct if we take a literal reading of the dialogue. But is one side closer to the truth?07/27/23