Howard Becker's study on becoming a marijuana user identified which of the following as a crucial step in the process of an individual becoming a regular user?
a. The physiological effects of marijuana naturally lead individuals to become regular users.
b. Legal consequences and societal stigma play the most significant role in an individual's decision to continue using marijuana.
c. Learning to enjoy the effects of marijuana through social interactions and techniques is crucial for continued use.
d. The availability and accessibility of marijuana are the most significant factors in determining whether an individual becomes a regular user.