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A
They use too much electricity
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B
They can burn the client's skin/scalp or scorch the hair if used carelessly or at too high a temperature
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C
They are too heavy
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D
They cannot style hair
Why this is the answer
The main safety concern with hot styling tools (flat irons, curling irons, hot rollers) is the risk of burning the client's scalp, ears, neck, or skin, and of scorching or damaging the hair, if the tools are used carelessly or set too hot for the hair type. Cosmetologists protect the client by controlling temperature, keeping the tool moving, shielding the scalp, and being especially careful near the skin. Using thermal tools safely and at appropriate temperatures is an important practical-safety point covered on the exam.
Source: Hair Care — Thermal Tool Safety