Which of the following represents Sawhorse eclipsed projection of ethane?

Stability of conformation : In staggered form of ethane , the electron clouds of carbon-hydrogen bonds are as far apart as possible. Thus, there are minimum repulsive forces, minimum energy and maximum stability of the molecule. On the other hand, when the staggered form changes into the eclipsed form, the electron clouds of the carbon-hydrogen bonds come closer to each other resulting in increase in electron cloud repulsion. To check the increased repulsive forces, molecule will have to possess more energy and thus has lesser stability. Staggered form is more stable.