Final answer:
The Socratic method is the training technique that actively engages trainees through questioning to stimulate critical thinking and self-discovery.
Step-by-step explanation:
The training method that uses questions to cause trainees to take an active role in training is known as the Socratic method. This technique, named after the classical philosopher Socrates, employs a series of questions to stimulate critical thinking and to draw out ideas and underlying presumptions. By asking probing questions, trainees are encouraged to examine their own biases and gaps in logic, leading to self-discovery and the development of personally reasoned beliefs and perspectives.