Answer: (A) Reinforcement
Step-by-step explanation:
A reinforcement is the term which is used to refers to the psychological behavior that helps in strengthening the future of an organisms by measuring the various types of factors such as high magnitude, behavior and the short latency.
According to the given question, Sofia's other offers her extra dessert when she finishes vegetables and this type of behaviorism is refers to the reinforcement effect.
Therefore, Option (A) is correct answer.