Final answer:
The anti conformation of butane is depicted by the staggered Newman projection, which is labeled A and represents the most stable conformation with minimal steric hindrance.
Step-by-step explanation:
The Newman projection that depicts the anti conformation of butane is the staggered conformation, labeled A in the Newman projections. In this conformation, the largest groups attached to the carbon atoms (in butane's case the -CH3 groups) are positioned 180° apart from each other, minimizing the steric interactions between them, and thus, this represents the most stable conformation. The other conformations, such as eclipsed (conformation C) and gauche (conformation B), are higher in energy because they have increased steric hindrance between the large groups.