29 CFR 1910, Subpart H,1910.132 (f) Each _______ shall be trained to know at least; when PPE is necessary; what PPE is necessary; how to properly don, doff, adjust and wear PPE; the limitations of PPE; and the proper care of PPE. a. Chief Inspector b. Inspector c. Contractor d. Project Manager

29 CFR 1910.132 (f) states: "The employer shall provide training to each employee who is required to use PPE. Each such employee shall be trained to know at least: (1) When PPE is necessary; (2) What PPE is necessary; (3) How to properly don, doff, adjust, and wear PPE; (4) The limitations of the PPE; and, (5) The proper care, maintenance, useful life, and disposal of the PPE."

Based on the regulation, the blank should be filled with the word "employee".

The options are:
a. Chief Inspector
b. Inspector
c. Contractor
d. Project Manager

Since "employee" is not an option, we need to choose the best fit from the provided choices. "Chief Inspector," "Inspector," and "Project Manager" are all specific job titles that typically refer to employees of a company. However, the term "Contractor" can refer to an individual worker (e.g., an independent contractor or an employee of a contracting company) who performs work on a site. OSHA regulations generally apply to all workers exposed to hazards, including those employed by contractors. In many industrial and construction settings, a significant portion of the workforce consists of contractors. Therefore, to ensure comprehensive safety, contractors (as individual workers) must also receive PPE training if they are required to use PPE. Among the given options, "Contractor" is the most encompassing term that represents a worker who needs to be trained, especially when considering workers who might not be direct employees but are still covered by safety regulations.

The final answer is $\boxed{\text{c. Contractor}}$