What are the main ingredients of beef stock?

Beef bones, herbs and 'mirepoix'

Explanation:

Beef stock is made by putting in water with a beef bone. This boils together and makes a brother from the meat left on the bone. Then herbs and 'mirepoix' are added for flavor. Mirepoix is common soup vegetables, includes peas, celery and carrots.

i would say the answer is b. zigzag lines of the leaves. i believe this is the answer because zigzag lines go in different direction while the other options like: the vertical lines of the trees, the dotted lines on the road, and the curved lines of the park benches go in one direction.