【单选题】

It can be inferred from the passage that the producers are focusing on the adolescent market because
A．adolescents account for a great part of the consumers and their tastes and preferences are of great importance to the producers.

B．adolescents often serve as consultants for their parents' purchasing behavior and sometimes even alter their parents' purchasing habits.
C．adolescents are turning their interests from acne medication and sport wears to other goods.
D．a research team has revealed that nearly half of American adolescents have part-time jobs, and thus, some extra money to spend.