Two Types of Wall Separate a Refrigerated Room from the Rest

Multiple Choice

Two types of wall separate a refrigerated room from the rest of a building.Wall 1 has half the thermal conductivity of wall 2.Wall 2 is half as thick as wall 1.The two walls have the same area.The rate of heat flow through wall 2 compared with the rate of heat flow through wall 1 is

A) four times greater.
B) twice as great.
C) the same.
D) half as great.
E) one-quarter as great.