Final answer:
The correct body mechanics for picking up an object off the floor involve bending at the knees to reduce strain on the back muscles, helping to maintain balance and prevent injury.
Step-by-step explanation:
When picking an object up off the floor, it's essential to utilize proper body mechanics to prevent injury. The correct option is c) "I will bend at my knees when picking an object up off the floor." This method aligns with safe lifting practices which emphasize keeping the back straight and using the legs to bear the weight. Bending at the knees reduces the strain on the back muscles and helps maintain the body's center of gravity, as illustrated by examples of people adjusting their stance to maintain balance when carrying various loads. This practice is a fundamental aspect of ergonomics and is crucial for long-term musculoskeletal health.