Question

he said slowly, \weve had no word of union movement.\
the spy bobbed with joy. \i knew it. thass why i hurried. came through that picket line
in the dark and all. i dont know if you realize, general—\
sorrel said coldly, \sir, dont you think, if this mans story was true, that we would have
heard something?\
sorrel did not approve of spies. the spy grimaced, blew. \you aint exactly on friendly
ground no more, major. this aint virginia no more.\
true, longstreet thought. but there would have been something from stuart? longstreet
said, \general stuarts cavalry went out a few days back. he hasnt reported any
movement.\
the spy shrugged, exasperated, glooming at sorrel. sorrel turned his back, looked at his
fingernails.
from michael shaara, the killer angels. copyright 1974 by michael shaara
the previous text suggested that sorrel trusted harrison as a spy. how does this historical
novel build on or challenge that idea?
it explains sorrels reasons for trusting harrison.
it demonstrates the rivalry between sorrel and harrison.
it shows sorrel doubting a report from harrison.

Explanation:

The text shows Sorrel questioning the spy's report by saying, "Sir, don't you think, if this man's story was true, that we would have heard something?" This directly challenges the idea that Sorrel trusts the spy, as he expresses doubt about the spy's claim instead of accepting it. The first option is incorrect because no reasons for trust are given, and the second is wrong as there is no indication of rivalry, only doubt.

Answer:

It shows Sorrel doubting a report from Harrison.