A Mother Expresses Concern That Her Toddler Still Sucks Her

A mother expresses concern that her toddler still sucks her thumb and asks about the adverse effect of thumb sucking. What response should the nurse make to this mother's concern?

A) "Thumb sucking in a child her age may cause ulcers in the mouth."
B) "Thumb sucking may lead to the development of oral thrush."
C) "It can cause problems she sucks intensely for long periods of time
D) "It isn't a problem until her baby teeth are being replaced by her permanent teeth."