Evidence from the Four-Card Task Suggests All of the Following

Evidence from the four-card task suggests all of the following EXCEPT that

A) generally people are poor at solving this task.
B) changing the problem into something with a more real-world validity improves performance on this task.
C) as with inductive reasoning, performance on deductive tasks varies based on the form of the problem.
D) problem solving about conditional statements is difficult to improve.