Which of the following is a key property of materials that can transmit heat?

The ability of a material to transmit heat is defined by its conductivity. Materials with high thermal conductivity allow heat to flow through them easily, making them effective at transferring thermal energy. For example, metals like copper and aluminum have high thermal conductivity, which is why they are commonly used in applications such as cookware and heat exchangers.

In contrast, insulation refers to materials that resist the flow of heat; they are designed to minimize heat transfer rather than facilitate it. Specific heat measures how much energy is required to change a material's temperature but does not directly relate to its ability to conduct heat. Ductility refers to a material's ability to deform under tensile stress, which is not related to thermal transmission. Thus, conductivity is the key property relevant to heat transmission.