Why is formal training of workers so important to most employers? Why don't employers simply let people learn about their jobs as they perform them?

The formal training is so important because of the benefits that bring to the company and the problems it could avoid.

Explanation:

To begin with, the fact that most of the companies consider important to provide a training program for their workers in the cases necessary indicates that the companies understand the fact that the workers need to be at their top level if they can when starting to work for the company, so in that order they will make no mistakes or at least the less possible. So that is the main reason why the employers do not let the people start working inmediately and learn from regular experience, so that they can avoid making mistakes and therefore avoid to elevate costs of money and time, etc.

the answer should be a)

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