Answer:
The correct answer is the second option: Extensive training and careful precautions are necessary to avoid accidents, injuries and illness.
Step-by-step explanation:
To begin with, all of the other options are describing the fact that the laws that regulate the workplace environment are no necessary or state that are enough. That is why that in the option chosen it is stated that it is absolutely necessary to have extensive training in the areas of work, specially those who are danger, and to take precautions around all so that the accidents can be prevented and the injuries will no happen as well as the illnesses. Therefore that the right to a safe workplace is accurately described by that statement.