Arrange the following conformers of butane in order of energy, lowest to highest: eclipsed, totally eclipsed, gauche, and anti.
(a) Anti, Gauche, Eclipsed, Totally Eclipsed
(b) Totally Eclipsed, Eclipsed, Gauche, Anti
(c) Gauche, Anti, Eclipsed, Totally Eclipsed
(d) Eclipsed, Totally Eclipsed, Anti, Gauche.