Concerning the Expert Systems Within Artificial Intelligence, Which of the Following

Concerning the expert systems within artificial intelligence, which of the following statements is FALSE?

A) They have been used to predict the weather, play chess, read, and tell when to buy and sell stocks.
B) They were developed by converting complex skills into clearly stated rules that a computer can follow.
C) They are programmed to respond as a human expert would.
D) They are useful for providing an organized description of events, but not for the prediction or diagnosis of conditions or events.