Explanation:
Thermal Diffusivity is the rahis clearly tio of conductivity to heat storage capacity i.e alpha = k/rhoxC this clearly implies that directly related to conductivity of the material and the conductivity of metals is high because of free electrons and closely packed lattice structure and Lead Aluminium Iron and mercury(liquid metal) are metals and rubber is non metal so option A is right. That means rubber stores more energy then it conducts
