The National Transportation Safety Board has proposed a new regulation that would require children under the age of two to be strapped into car seats in their own seats on airplanes. Currently, children under the age of two are nonpaying passengers who ride on their parents' laps. What opportunities will airlines and parents have for input on the proposed rule? a. They can go to court to block the proposal. b. They can send in comment letters to the NTSB. c. They can write their congressional representatives. d. They can seek a presidential veto.