(A) The most stable conformation for $n$-butane is the anti-staggered form,where the two bulky methyl groups are at a dihedral angle of $180^{\circ}$

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(A) The most stable conformation for $n$-butane is the anti-staggered form,where the two bulky methyl groups are at a dihedral angle of $180^{\circ}$ to each other.In this conformation,the steric repulsion between the methyl groups is minimized,making it the most stable conformer.This structure is represented in option $(A)$.