单选题：What do researchers want to find out, according to the third

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题目类型：单选题
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题目内容：

What do researchers want to find out, according to the third and fourth paragraphs? A．Whether or not audible or written directions are distracting.
B．how long it will take the driver to respond to auditory and visual stimuli.
C．How the driver perform under certain metal workload.
D．All of the above.

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