David should take his grievances to the Human Resource Department of the company. Option B.
A Human Resource is a department that is concerned with all the issues of employees of the organization. HR department is meant to deal with the employees, from the beginning to the end of ab employees tenure. From recruitment till the retirement, from salaries to the allowances, from hiring to firing, from attendance to leaves, each and every issue of the organization that is related to the Human Resource come under the HR department.
So when some of David's workers are injured due to the lack of safety equipment, David is definitely going to take his grievances to the HR department of the company.