B.
For Line A-A:
Imagine a hill or a small mountain. The cross-section along line A-A would show an upward slope on one side (representing the ascending terrain) and a downward slope on the other side (representing the descending terrain). The peak of the hill or mountain would be at the center of the cross-section.
For Line B-B:
This could represent a valley or a canyon. The cross-section along line B-B would show two upward slopes on either side (representing the rising terrain) with a flat or gently sloping area in the middle (representing the valley floor or canyon bottom). The highest points of the slopes would be towards the edges of the cross-section, gradually sloping down towards the middle.
