Don was driving his truck when a board fell out of the truck bed and onto the road. Alice, who was driving closely behind Don's truck, tried to avoid the board, swerved and struck a telephone pole, causing her severe injuries. Which of the following is correct?
a. Don is strictly liable to Alice for her injuries.
b. In a comparative negligence state, the actions of Don and Alice will be weighed to determine liability.
c. Don was not negligent in allowing the board to fall out of his truck.
d. Don is engaging in ultrahazardous activity.