If the cost to firms of reducing workplace injuries by 1 percent is $1,000 a year for each worker, then it is efficient for firms to reduce workplace injuries by 1 percent if: Select one: a. the value workers place on the reduction in workplace injuries is less than $1,000 per year. b. the value workers place on the reduction in workplace injuries is at least $1,000 per year. c. firms are earning an economic profit of at least $1,000 per year. d. firms are earning an economic profit of less than $1,000 per year.