The closest-packing sequence $A B C A B C . . . . .$ represents:

primitive cubic packing

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body-centered cubic packing

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face-centered cubic packing

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hexagonal packing

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Solution

The correct option is C face-centered cubic packing
The closest-packing sequence $A B A B . . . . .$ represents hexagonal packing.
The closest-packing sequence $A A A A . . . . .$ represents primitive cubic packing.
The closest-packing sequence $A B C A B C . . . . .$ (with spheres of the third layer placed into octahedral voids) represents face-centered cubic packing.

Hence, option $C$ is correct.

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