The answer is a)growth and development is a gradual
Well, I don't think you can present any evidence to show she is wrong. Behaviorists believe that children and any human being acquire language through conditioning - you present them with a condition under which they learn a certain language. Since this woman is a behaviorist, I don't see why she is wrong in believing what she does.
B. Sharp mental acuity
Mental acuity refers to being mentally sharp. If you're mentally sharp, you have an excellent memory, and you find it easy to complete different tasks. Lack of sleep can effect this.
