The purpose of George Spilich’s experiments is ______. Which of the following statements is true?

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问题 The purpose of George Spilich’s experiments is ______.
Which of the following statements is true?

选项 A、Active smokers in general performed better than deprived smokers.
B、Active smokers responded more quickly than the other subjects.
C、Non-smokers were not better than other subjects in performing simple tasks.
D、Deprived smokers gave the slowest responses to the various tasks.