Psychological studies show that most teenagers verbally reject ideas and opinions related to them by their parents. This rebellious verbal behavior often worries parents who feel they do not have control over or influence on their children's decisions. It can be concluded that the opinions communicated by a parent to a teenager will have no effect on that teenager.
Which of the following, if true, casts the most doubt on the argument's conclusion?
A. A recent study shows that even issues of national security can cause an increase in the consumption of alcohol and illegal substances by teenagers.
B. Last year, the son of the author of the book Violence solves nothing was incarcerated for the violent robbery of a downtown liquor store.
C. Many psychological studies in the field of family communication recognize the ability of teenagers to shut out or distort messages they receive from others.
D. A recent survey shows that 92% of the parents of drug-addicted teenagers regularly warned their children of the consequences of substance abuse.
E. When faced with an extremely difficult dilemma, the majority of people base their final decisions upon values that they were brought up with.