Which is currently responsible for shaping mars’s surface?

ANSWER:

Wind is currently responsible for shaping Mars’s surface.

EXPLANATION:

Mars surface is covered by the large carbon dioxide content. About 95% surface is covered by carbon dioxide. So for the shaping of the Mars’s surface wind is the most important factor. The surface of mars do not contain much of the liquid or solid materials. So, wind constantly shapes the different shape of the Mars’s surface. Further, there are many other factors responsible but the most important and influencing factor is the Wind.

A,) cause a & b are equal & both gives 180°