What is the similarity in showing grass and hair with lines?

Short directional lines show texture in both

The governing concept is directional line used to describe texture and growth. Individual blades of grass and strands of hair have a visible direction, so a group of short, repeated strokes can suggest their surface, flow, and density. The strokes do not need to be identical; variation in length, spacing, curvature, and darkness makes the texture more natural. Option A is correct because the same basic line strategy works for both subjects. Large circles do not normally communicate the strands of grass or hair, and saying that lines are not used contradicts the drawing method. Neither subject is always square. The artist should also avoid filling every area with equally dark marks, because selective directional strokes preserve light, form, and softness while still making the texture recognisable.

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