Which of the Following Statements About Reinforcement Is True

Which of the following statements about reinforcement is True?

A) Reinforcement may increase or decrease a behaviour it follows, as it depends on the targeted behaviour of the organism.
B) Reinforcement must be primary to have an impact.
C) Reinforcement must be delivered every time a behaviour is emitted to strengthen that behaviour.
D) Reinforcement for one person may be punishment for another.