Assume a Heteronuclear Diatomic Molecule,AB,forms a One-Dimensional Crystal by Lining

Assume a heteronuclear diatomic molecule,AB,forms a one-dimensional crystal by lining up along the x-axis.Also assume that each molecule can only have one of six possible orientations,corresponding to atom A facing in either the positive or negative direction along the x-,y-,or z-axis.If the molecules are arranged randomly in the six directions,the molar entropy at absolute zero should be

A) R ln 6.
B) R ln 6⁶.
C) R ln 6!
D) 0.

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