Which of the following students provides the most accurate summary about phone use when someone is driving?

a. Henri: "As long as someone other than the driver is talking on the phone, there's no problem."
b. Edith: "As long as a driver uses a hands-free phone, there's no problem."
c. Charles: "When drivers are talking on the phone, they pay less attention to objects that appear in the middle of their visual field."
d. Jeanne: "When drivers are talking on the phone, the passengers can carry on a continuous conversation without affecting the driver."

Ans: c