What was the purpose of slave work songs? A. They helped the slaves move together and pass the time.
B. They were a way for the slaves to learn the English language.
C. Just for fun.
D. They helped the slave owners locate the workers.

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.

based on the images pictured above, the major difference between the two cathedrals: the cathedral of notre dame and the amiens cathedral, is that the cathedral of notre dame emphasizes the horizontal lines while the amiens cathedral emphasizes the vertical lines.