Which of the Following Situations Is a Secondary Reinforcer to Tobacco

Which of the following situations is a secondary reinforcer to tobacco use?

A) When Margie drinks at a bar,she has a habit of smoking cigarettes.
B) When Dustin plays baseball,he uses spit tobacco.
C) When Sharon studies for her upcoming exam,she has to smoke a cigarette.
D) All of these choices are examples of secondary reinforcers to tobacco use.