How can volume be suggested in a circular form using lines?

Correct answer: By drawing curved lines according to the roundness of the form

Answer: A, by drawing curved lines according to the roundness of the form. Volume means that a flat drawing gives the impression of a three-dimensional object. On a circular or rounded form, curved lines that follow its surface can suggest turning, bulging, and depth. A is correct because the direction of the lines agrees with the form's roundness, helping the viewer imagine its surface. B, using only straight lines, may flatten or distort a rounded object unless used very carefully for another purpose. C, writing the name, gives information through words but does not create visual volume. D, folding the paper changes the physical sheet rather than using drawn lines to suggest volume in the circular form. Lines should follow the surface rather than cross it randomly. Memory cue: contour-like lines that wrap around a rounded form help make it appear three-dimensional.