Final answer:
The rate of conductive heat transfer for a substance increases with increased temperature difference and surface area.
Step-by-step explanation:
The accurate statement regarding conductive heat transfer for a substance is that the rate increases with increased temperature difference and surface area. Heat conduction occurs when there is a difference in temperature between two adjoining regions of a substance, and the rate of conduction depends on the temperature difference (AT) and the cross-sectional area. A larger temperature difference and a larger surface area will result in a higher rate of conductive heat transfer.