Which of these facts best illustrates why regulation of alcohol consumption is necessary? a) about one third of the more than 40,000 road traffic deaths in 2002 involved alcohol. b)  studies show that drinking just 0.5 ounces of alcohol a day can lower the risk of stroke and heart attack. c)  seventy-seven percent of men and 60 percent of women were drinkers by the early 1970s.  d) the alcohol content in beers can vary from two percent to as much as eight percent.