In a Laboratory,smokers Are Asked to "Drive" Using a Computerized

In a laboratory,smokers are asked to "drive" using a computerized driving simulator equipped with a stick shift and a gas pedal.The objective is to maximize the distance covered by driving as fast as possible on a winding road while avoiding rear-end collisions.Some of the participants smoke a real cigarette with nicotine immediately before climbing into the driver's seat.Others smoke a fake cigarette without nicotine.You are interested in comparing how many collisions the two groups have.In this study,the independent variable is _______________.

A) the use of nicotine
B) the use of a driving simulator
C) the number of collisions
D) the driving skills of each driver

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