A researcher wishes to use an observational study to determine the proportion of drivers who approach an intersection while wearing their seat belt, depending on how many passengers are in the car. The researcher stays hidden, using cameras and sensors, during times when traffic is light and when it is heavy. After observing for two weeks and analyzing the data, the researcher discovers that drivers wear their seat belts 84% of the time when the number of passengers is less than two, but wear it 94% of the time when the number of passengers is two or more. He concludes that an increase in the number of passengers in a vehicle increases the likelihood that drivers will wear their seat belt. Is it correct for the researcher to draw this causation between the use of seat belts and how many passengers are in the vehicle?
A:Yes, he is correct, because the number of drivers who approach an intersection while wearing their seat belt increases as the number of passengers increases.
B:No, he is incorrect, because the researcher used an observational study, and therefore no causation can be drawn.
C:Yes, he is correct, because the percentage of time that drivers wear seat belts increases by 10% when there are two or more passengers in the vehicle.
D:No, he is incorrect, because the study was only conducted by one researcher.
