Final answer:
Makeshift wiring poses the most fire hazard risk, whereas circuit breakers and grounded electrical equipment enhance safety measures against thermal hazards and electric shocks.
Explanation:
Makeshift wiring is most likely to create a fire hazard among the options provided. Makeshift wiring can lack proper insulation or grounding, leading to short circuits and potential fires. In contrast, circuit breakers are safety devices that interrupt excessive currents, helping prevent thermal hazards, while grounded electrical equipment reduces the risk of electrical shocks by providing a safe path for electricity.
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