What organization is responsible for ensuring compliance with workplace safety standards?

The organization responsible for ensuring compliance with workplace safety standards is OSHA, which stands for the Occupational Safety and Health Administration. OSHA's primary goal is to ensure safe and healthy working conditions for employees by enforcing workplace safety regulations and standards. This involves setting standards for various aspects of workplace safety, conducting inspections, and providing training and education to employers and workers on how to comply with safety regulations. OSHA also investigates workplace accidents and complaints related to unsafe working conditions to improve safety practices across different industries.

The other organizations mentioned in the options have different focuses: the EPA (Environmental Protection Agency) deals with environmental protection and regulations; the NTSB (National Transportation Safety Board) is primarily involved in investigating transportation accidents, and the CDC (Centers for Disease Control and Prevention) focuses on public health and disease control. Each of these entities plays an important role in their respective fields, but OSHA is the agency specifically tasked with workplace safety compliance.