Why is the axis line important for a tilted cylinder?

It shows the tilt direction and keeps the form aligned

The governing concept is structural alignment in three-dimensional drawing. An axis line is an imaginary centre line running through the length of a cylinder. When the cylinder is tilted, this line establishes its angle and helps the artist place the upper and lower elliptical ends in the same direction. It also keeps the side edges related to the central orientation, so the object appears stable rather than twisted. Therefore, option A is correct because it explains both tilt direction and form alignment. Option B confuses a construction guide with a change of shape; option C concerns lighting, not structure; and option D is unrelated to visual drawing. A useful method is to draw the axis lightly first, construct both ellipses around it, and then add the visible contours.

This is a Class 9 Art Education question. Chapter: Elements of Art. Topic: Form.