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A wall has two layers \( A \) and \( B \), each made of different materials. Both layers are of same thickness. But, the thermal conductivity of material \( A \) is twice that of \( B \). If, in the steady state, the temperature difference across the wall is \( 24^{\circ} \mathrm{C} \), then the temperature difference across the layer \( B \) is :
(A) \( 8^{\circ} \mathrm{C} \)
(B) \( 12^{\circ} \mathrm{C} \)
(C) \( 16^{\circ} \mathrm{C} \)
(D) \( 20^{\circ} \mathrm{C} \)
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