Which of the Following Is the Most Plausible Way to Improve

Which of the following is the most plausible way to improve performance on the Wason four-card task?

A) Reframe the problem so that it uses valid categorical syllogisms instead of conditional statements.
B) Encourage participants to flip over all of the cards.
C) Change the context of the problem so that the participant imagines he or she is a cop searching a bar for underage drinkers.
D) Research suggests that nothing can be done to improve performance on this task.