Consider the Following Image Showing a Sample of a Trapped

Consider the following image showing a sample of a trapped gas in a cylinder with a movable piston. Which of the following statements is(are) illustrated by this image?
(i) Gases may be compressed.
(ii) Gases expand to fill their containers uniformly.
(iii) All gases have low density.
(iv) Gases may be mixed.
(v) A confined gas exerts constant pressure on the walls of its container uniformly in all directions.

A) i only
B) ii only
C) iii only
D) ii and iv
E) i and ii