If a harmful substance is used in a workplace, the company must provide what informational document to employees? A. Material safety data sheet B. Ergonomics checklist C. Guarantee D. Warranty

The correct document to issue here is A, the material safety data sheet. This document provides useful information on the safe operation of equipment or material in order to prevent accidents or damages at the workplace and the risks associated with wrong use of the product. The guarantee and the warranty do not apply here because they basically mean the same thing, that is a promise to cover some damages under certain conditions, though the latter is the verbal formulation of the former. The ergonomics checklist isn't relevant here either as it deals with aspects to improve ergonomics while working.