which of the following materials has lowest specific heat capacity
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The main determination of heat capacity is its molecular weight. Hydrogen has a low molecular weight and in turn has a very high heat capacity [c=14.307 J/gK]. Hydrogen isn't practical for uses as an insulator though. Styrofoam and many ceramics are quite heat resistant, but the best "insulator" is actually a total vacuum. Gold, being a heavy metal, has a very low heat capacity [c=0.128 J/gK]. Radon also has a very high molecular weight, and has a heat capacity of just 0.09 J/gK. I'm not certain that these are the highest and lowest heat capacities of all substances, but they are the highest and lowest of all the elements
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