Select the statement which indicates a poor ergonomic practice.

a. bob twists his back to pick up the materials to feed his press machine.
b. greta stands with a neutral posture on an anti-fatigue mat in her workstation.
c. michelle uses a headset while on the phone to avoid bending her neck awkwardly. suspend assessment

A. Bob twists his back to pick up the materials to feed his press machine.

Explanation:

Ergonomic is the proper use of the mechanics of the body, in this case bob shouldn´t be twisting his back to pick up the materials he should be turning around with his whole body, this can put undesired pressure on his lower back and waist and can eventually lead to damage in the tissue, nerves and muscles.