A study of reaction times used three comparable large groups of adults. In each case, the adult had to press a button as soon as a light flashed. The interval from the light switching on to the button being pressed was recorded. Group 1 carried out the task 30 minutes after smoking a cigarette. Group 2 carried out the task 30 minutes after drinking 2 units of alcohol. Group 3 acted as the control group. This control group did not smoke or drink alcohol. The graph presents the findings from this study. What is the best conclusion from the data?
- ANicotine is a depressant and alcohol is a stimulant.
- BNicotine reduces reaction times and alcohol increases reaction times.
- CNicotine makes reactions slower and alcohol makes reactions faster.
- DNicotine and alcohol are both addictive.