The answer should be D. hypothesis
Answer:
The work done on the gas is equal to the area under the curve pv diagram w = area of triangle = 1/2 (base)(height) = 1/2 (BC)(Ac) = 1/2 (3v - v)(3p - p) = 1/2 (9 vp - 3 vp - 3vp + vp) = 4 vp/2 W = 2 vp
Check attachment for the diagrammatic representation
Mass
The mass of an object attract other objects with mass but, and objet has to have more mass that another object to physically move it
Example
The sun and the earth the sun has a large enough mass to not only make our planet rotate around him but seven more
This is a pretty long question