Which of the following words best characterizes the European attitude to older workers

A．top-level NASA officials made an arbitrary decision for takeoff
B．designers of the spacecraft failed to assess the problem with the booster
C．cold weather caused the O ring to come off the rocket booster
D．the tragedy was caused by at least three factors working together

A．offer early retirement to all employees
B．offer incentives to businesses to take on younger employees
C．only employ young trainees
D．set specific age limit for employment