Answer: D. A, B AND C
With the numerous hazards associated with construction sites, safety signs are very essential in minimizing the risk of accidents and injuries. The correct answer is D as all the options given can be used in notifying a motorist upon entering a work zone. To ensure the message on entering a work zone is passed, all means are utilized for clarity. With this, a flagger, a flashing arrow panel sign, and a diamond-shaped orange work zone sign are all simple ways in which this can be achieved