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Coolest in radiations automobile must be

$(a)\;\text{high calorific value} \\(b)\;\text{high thermal energy} \\(c)\;\text{high specific heat} \\(d)\;\text{high vicoscity}$

The collant in radiators must have high specific heal.
Hence c is the correct answer.

The only option that is perfect is “high thermal energy”, as it protects the radiation system while keeping it cool and stabilizing the excess heat. It is the most essential substance to keep your radiator well maintained. The pH level of coolant may differ along with engine thus it must be cleared before buying it from auto part dealer. Although, many companies provide this information in car manual book too.