The correct response is:
Electrons from the carpet move into the wool socks, giving Sally and her socks a positive charge.
In this situation, the friction between Sally's wool socks and the nylon carpet causes electrons to transfer from the nylon carpet to the wool socks. As a result, the wool socks become negatively charged, while Sally and her socks (since they are in contact) will overall take on a positive charge due to the loss of electrons.