The correct answer is A. Collective bargaining.
Collective bargaining is a process in which representatives of a group of employees negotiate with representatives of the employer on behalf of the employees. The goal of collective bargaining is to reach an agreement on wages, benefits, and working conditions.
Collective bargaining is a form of participation because it allows employees to have a say in their working conditions. It is also a form of democracy because it gives employees a voice in the workplace.
B. Risk is not a form of participation because it is not something that employees have control over. C. Wages are not a form of participation because they are determined by the employer, not by the employees. D. Rating is not a form of participation because it is a way of evaluating employees, not a way of giving them a say in their working conditions.