(B) The lowest energy conformation is the one in which the two methyl groups are as far apart as possible,i.e.,$180^{\circ}$ away from each other.This

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(B) The lowest energy conformation is the one in which the two methyl groups are as far apart as possible,i.e.,$180^{\circ}$ away from each other.This conformation is maximally staggered and is called the anti conformation.The order of stability of these conformations is: $\text{Anti} > \text{Gauche} > \text{Partially eclipsed} > \text{Fully eclipsed}$.