Which body part can be strained by lifting a heavy object incorrectly?

Correct answer: Back

Lifting a heavy object incorrectly can place excessive force on the muscles, joints, and supporting tissues of the body. The back is especially vulnerable when a person bends from the waist, keeps the load far from the body, twists suddenly, or tries to lift more than they can manage. Safe lifting usually involves assessing the load, keeping it close, bending the knees, maintaining a stable posture, and raising it with the legs rather than pulling mainly with the back. Assistance or equipment should be used when necessary.

Option B is correct because incorrect lifting can strain the back and lower-back region. The word “can” is important: injury is a possible risk, not an unavoidable result every time. Options A, C, and D are not the main body areas normally stressed by lifting a heavy object in this situation. Thus, the question tests awareness of safe handling and the need to protect the back through suitable lifting technique.