If,with Steady State Heat Flow Established,you Double the Thickness of a Wall

Multiple Choice

If,with steady state heat flow established,you double the thickness of a wall built from solid uniform material,the rate of heat loss for a given temperature difference across the thickness will

A) become one-half its original value.
B) also double.
C) become one-fourth its original value.
D) become 1/ of its original value.
E) become four times its original value.