Which of the following is an example of a social dysfunction?

a. after seeing the importance of keeping litter off the roads, people from the community volunteered to clean up the local streets and highways.
b. after a book was banned from public libraries because it was judged to be obscene according to local standards, sales of the book increased dramatically.
c. after reading about the need to eat health, liam decided he would stop eating candy.
d. after studying the jobs that will be most in demand in the future, tym decided to make a change in his career path.