The substances have the same mass and are heated by the same amount, the substance which heat up fastest is copper.
Those substances which are able to conduct the flow of electric current and heat are known as conductors.
Metals are good conductors of heat and non metals are bad conductors, gold show very poor conduction because of their stable nature. Among aluminium, copper and iron; copper is the best conductor of heat. So, when we heated the given species with equal amout of heat, then copper heat up the fatest.
Hence, correct option is (A) i.e. copper.
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