How can you distinguish a vein from other structures in a leaf?

Monocots and dicots differ in their patterns of venation. Monocots have parallel venation in which the veins run in straight lines across the length of the leaf without converging. In dicots, however, the veins of the leaf have a net-like appearance, forming a pattern known as reticulate venation.

Explanation:

i think that the best answer would be c.

tell me if im wrong : )