What central idea is implied in this paragraph? Read this paragraph from The Dark Game.

It may seem surprising that no Confederate
sympathizers took action against Van Lew, given her
strong and public views on secession and slavery.
Surely there were suspicions, especially among her
upper-crust neighbors, but the matter never went
beyond those suspicions. Historians have suggested
that the secessionists were victims of their own
cultural bias, believing that no aristocratic person, and
certainly not a lady, would ever consider taking part in
anything as impolite as spying. A true lady managed
her servants, prepared parties and gatherings, and
blindly supported her husband. Such attitudes worked
in Van Lew's favor, diverting suspicion from her.

Elizabeth Van Lew did not follow the rules society
set forth for ladies of her time and social class.
Elizabeth Van Lew was a successful spy because
society did not expect a lady to serve in that role.
Elizabeth Van Lew was able to disguise her spying
activities because she kept her views about the war
to herself.
Elizabeth Van Lew created for herself an untrue but
believable cover story: she was a wealthy lady living
in a fancy neighborhood.