The answer to this question is D. It's pretty simple to figure out the answer using the elimintation process. Its obviously not Mars because Mars has an atmosphere mostly filled with carbon dioxide with an atmospheric pressure of 600 pascals. Secondly we go to Mercury. Its obviously not Mercury because Mercury has an atmosphere made up of hydrogen,helium, and oxygen. Lastly, we find ourselves at Jupiter. It is obviously not Jupiter because Jupiter has the largest planetary atmosphere in the system. Therefore the only option left is Mercury.