What main purpose does the line in this composition serve

B)To lead the eye.

That is the perpose of it

To provide movement

Explanation:

Traditionally, the line is used to lead the eye through an image. However, depending on the image and the purpose of it, the line can be used to create a certain kind of movement or the feeling of movement. In this case, the brand is related to surf, so the line is used to create the feeling or the idea of a wave.