Which of the following might be used as supportive evidence that cell phones are dangerous to use while driving a car?

a. a study conducted by university of utah psychologists shows that motorists who talk on cellular phones are as impaired as drunken drivers.

b. according to the harvard center for risk analysis, a driver using a cell phone is 80 percent less likely to be killed than a drunk driver.

c. molly herrington, an opponent to banning cell phone use while driving, states, "talking on my cell phone keeps me sane in traffic."