Which option is the correct application of cross-contour?

Correct answer: Lines curving along the surface of a round fruit

Answer: A. A contour line describes the edge of an object, while a cross-contour line travels across the object and follows the direction of its surface. On a round fruit, curved lines that wrap around the surface help the viewer imagine its bulging volume and three-dimensional form. Option A is therefore the correct application. B describes an ordinary contour line because it only marks the outside edge. C describes a tonal or colour treatment, not a line moving across a form. D gives a repeated background pattern; unless the lines follow a form’s surface, they are not cross-contours. Cross-contours do not have to be dark or numerous; their important quality is that they respond to the object’s curvature. Memory cue: ordinary contour goes around the edge; cross-contour appears to wrap across the surface.