According to a Recent Analysis of Data from a Sample

According to a recent analysis of data from a sample of nationally representative high school seniors, which of the following trends in regard to adolescents' civic engagement and political participation is true?

A) Since 1990, there has been a steady increase in the proportion of young people who report participating in community service activities.
B) Since 1990, there has been a decrease in the proportion of young people who report participating in conventional civic activities (example: voting, contracting elected officials) .
C) Since 1990, the proportion of young people who engage in alternative political activities (e.g., boycotts, demonstrations) has fluctuated.
D) All of the above are true.