Concept:A whole baked rock bun can be examined by its outer appearance, so visual and surface features are considered.
Explanation:Rock buns have an uneven, cracked outer surface, so lines are seen.
They have a distinct bun or rock-like form, so shape is seen.
Their rough, crumbly outer surface shows texture.
They are examined whole, so an internal dot is not seen.
Therefore, the likely design elements are texture, shape, and lines.
Answer:C. Texture, shape and lines.