Final answer:
Arms should not be extended away from the body at an angle greater than 90 degrees to reduce injury risk (option b).
Step-by-step explanation:
When considering safety and preventing strain or injury, arms should never be extended away from the body at an angle greater than 90 degrees. Extending the arms away at a larger angle can increase the risk of musculoskeletal injuries, especially when lifting weights or performing tasks that involve manual labor. Therefore, the arms should be kept at equal to or less than a 90-degree angle from the torso to maintain a safe working position and reduce the potential for injury.
Hence, the answer is option b.