The correct answer is to lead astray, to give to an enemy by treachery.
The first part, be·tray v. \bē-ˈtrā\, tells us how to pronounce the word while Middle English, from be- + trayen (to betray) tells us the origin of the word. So if Tracie needs to verify the meaning of the word betray, the portion of the entry that best allows her to do this is to lead astray, to give to an enemy by treachery.
