Resistance to heat flow by conduction is proportional to (where, t & ρ are thickness & density of the material respectively and A = area normal to the direction of heat flow.) ?

Question

Accepted Answer

All A., B. & C.. Thermal resistance is proportional to thickness (t) and inversely proportional to area (A). Density ($ho$) affects thermal conductivity, but the proportionality listed suggests dependence on all factors mentioned.