Answer: A. BEHAVIOURISM
Explanation:
BEHAVIOURISM
Proponents of this theory believe learning to be nothing more than acquiring new behavior based on environmental conditions.
They identify conditioning as a learning process and divide it into 2, CLASSICAL and BEHAVIORAL conditioning.
BEHAVIORAL CONDITIONING is the relevant conditioning here as it posits that a response will be more likely to repeat itself if there is a reinforcement mechanism such as a reward or incentive.
For example, leading behaviorist B.F. Skinner used reinforcement to teach pigeons to dance.
Therefore if the kids are reinforced in toilet training they'll get a grasp of it.