Thanks for the question! This question is asking us about something that Borges and the author of passage B would be likely to agree on.
(B) tells us that they would both agree that any science fiction story could be read as if it were a detective story. Let’s take a look at what Borges says. In lines 5-8, we’re told that a special type of reader confronts literature with such incredulity and suspicions that he or she might read any narrative as a detective story; since science fiction stories are a type of narrative, it’s possible that they’re read as detective stories by this group of readers.
Now, for the author of passage B. Take a look at lines 32-33, where the author says that “we are free to read any text by any reading protocol we wish.” Well, if we can use any reading protocol we wish, then we can read science fiction stories as if they are detective stories (since that’s a kind of reading protocol we can use). And so it seems that both authors would agree on (B).
Hope this helps! Feel free to ask any other questions that you might have.