Which of the following best defines ergonomics?

The best definition of ergonomics is indeed the interaction between humans and products. Ergonomics focuses on how people interact with various products and systems, with the goal of enhancing user comfort, efficiency, and overall satisfaction. This field takes into account human physical, cognitive, and emotional characteristics to create designs that fit the needs of the user.

By understanding how users will interact with a product, designers can tailor their designs to reduce discomfort, prevent injury, and improve usability. This is essential in various applications, from consumer products to workplace equipment, ensuring that daily tasks can be performed safely and effectively.

The other selections, while relating to design or interaction with environments, do not accurately capture the essence of ergonomics. For instance, definitions related to economics, environmental impacts, or production costs focus on different aspects of design processes and do not address the human-centered focus that defines ergonomics.