Victor holds doors open for attractive female classmates because they usually smile when he does so. Victor's behavior is maintained by reinforcement.

negative
secondary
higher order
primary

Victor holds doors open for attractive female classmates because they usually smile when he does so. Victor's behavior is maintained by Secondary reinforcement

Explanation:

Secondary reinforcement refers to the situation when the stimulus reinforces a behavior after getting associated or connected to the primary reinforcer. When a dad gives chocolates to the toddler and he responds by saying 'bye'.  The toddler has received the treat which is the primary reinforcer and also  the verbal farewell which is the secondary reinforcer.

Primary reinforcement involves a reward that fulfills a biological need. Secondary reinforces  work through association with primary reinforcers. Secondary reinforcers are mostly categorized as social reinforcers, activity reinforcers and token reinforcers. Token reinforcers will mostly be in the form of gifts.