Wason's selection task 2

@If a person is drinking beer, then that person must be over 18 years old.@

These four people are all having a drink. You can check their age or their drink. Who should you check to make sure that the rule is observed?

  1. John, who is drinking beer.
  2. Mary, who is 16 years old.
  3. Peter, who is drinking water.
  4. Jane, who is 20 years old.