What did she deny regarding the old lady?

The correct choice is that she denied robbing the old lady. This choice signifies a specific action—robbery—that implies a serious accusation and suggests intent to commit theft. Denying this reflects a strong assertion about her innocence in that matter, which can indicate the gravity of the situation surrounding the old lady.

Understanding the other choices helps clarify why they don't capture the primary accusation as effectively. For instance, denying having met her or knowing her business involves claims of familiarity rather than accusations of wrongdoing. Meanwhile, denying helping her could imply a lack of support rather than involvement in a criminal act. Thus, the focus on robbery emphasizes the severity of the situation and aligns with what might be legally or morally significant in that context.