Which of the Following Situations Provides the Best Example of "Real

Which of the following situations provides the best example of "real time" learning?

A) allowing trainee firefighters to put out a small building fire in the presence of trainers
B) engaging trainee flight controllers with a simulator so that they can learn to cope with near misses of aircraft
C) using a virtual reality setting to train drivers of trolley cars in San Francisco
D) having a trainee instructor videotape a lecture without trainees present