In the context of training and development, involves a work-simulation situation in which a job is performed under a condition that closely simulates the real work environment.

vestibule training

Explanation:

vestibule training means to train new employers or students according to practical and actual work environment. It is also known as job education training in which fundamental and actual work skills and education is given to worker or employer to learn actual and practical work. Like to give education on use of  tools and equipment which is require in actual job.

d is the correct answer.

b is incorrect because it makes food by itself

c is incorrect because us humans don't know how to produce their own food using the sun like plants.

a is incorrect because consumers can depend on carnivores for eating food for consumers to eat the dead organism. same thing with omnivores.

the telephone is the answer