Which of the following explanations for the "progression" of users from the use of marijuana to the use of more dangerous drugs focuses on properties inherent in the drug that cause this phenomenon? The:
a. sociocultural school
b. pharmacological school
c. selective interaction/socialization school
d. predisposition school
e. none of the above.

You are the on-duty desk sergeant at the local police station. a man walks in and says, "i killed someone and want to confess." you grab your digital voice recorder and direct the man to a chair. he sits down and tells the tale of what turns out to be a first-degree murder. you record every word, including the numerous instances in which you said, "uh- huh" and "i see." satisfied that the subject did, indeed, commit a murder, you place him under arrest. the confession is: