Answer:
Option B
Step-by-step explanation:
Operant conditioning is a type of conditioning that logically appreciates positive behaviours mostly based on rewards of the fact that someone has carried out an act but just to keep such positive act with such person, you engaged in a reward system such that when such person does that act again they should expect a reward.
Relating to the passage above, it is obviously a operant conditioning, the sister has seen what her mother does to her brother when he carries such act, she wants to emulate such act to get reward this is an example of operant conditioning.