A Task Force on Problems of Alcohol Is Investigating Rates

A task force on problems of alcohol is investigating rates of alcohol problems among various cultural and ethnic groups. What are they likely to find when they issue their report?

A) Overall, there have been sharp drops in the rates of alcohol problems across ethnic groups.
B) Ethnic groups with high rates of problems in the past have even higher rates now due to social changes.
C) There have been few changes in the rates of alcohol problems for each ethnic group over the past few decades.
D) Ethnic groups with high rates in the past seem to have decreasing rates, whereas groups with low rates are now increasing.