The diagram shows four slabs of different materials with equal thickness, placed side by side.Heat flows from left to right and the steady-state temperatures of the interfaces are given.Rank the materials according to their thermal conductivities, smallest to largest. 
A) 1, 2, 3, 4
B) 2, 1, 3, 4
C) 1, 2, 4, 3
D) 3, 4, 2, 1
E) 4, 3, 2, 1
Correct Answer:
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