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A
Style hair faster only
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B
Prevent strain and long-term injury to the body during repetitive work
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C
Impress clients
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D
Replace tool maintenance
Why this is the answer
Maintaining good posture and ergonomics — such as keeping the back straight, positioning the client at a good height, not over-reaching, and holding tools properly — helps prevent muscle strain, fatigue, and long-term repetitive-stress injuries that are common in a physically demanding, repetitive profession like cosmetology. Protecting one's own body supports a sustainable career. Ergonomics is part of the safety content on the exam, reflecting that safety covers the professional's wellbeing as well as the client's.
Source: Hair Care — Ergonomics