In Berinia, the age at which people could begin to drink alcohol legally used to be 18. In 1990, in an attempt to reduce alcohol consumption and thereby to reduce alcohol-related traffic deaths among Berinians under 21, the legal drinking age was raised to 21. Alcohol-related traffic deaths among people under 21 have decreased significantly since 1990. Nevertheless, surveys show that people in that age-group drink just as much alcohol as they did before 1990. Which of the following, if true of Berinia, most helps to resolve the apparent discrepancy?
A: Alcohol-related traffic deaths among people over 21 have increased slightly since 1990.
B: For the population as a whole, annual alcohol consumption is no lower now than it was in 1990.
C: The proportion of people under 21 who own a car is higher now than it was in 1990.
D: Alcohol consumption away from home, for example in bars and restaurants, is much lower among people under 21 than it was in 1990.
Choose A, B, C or D as your solution.
D