Inside plant veins are two different types of tissues. Xylem carries water and minerals up from the roots of the plant and phloem carries the sugars (nutrients) away from the leaf to areas where the plant is growing or to storage areas in the plant.
How does the placement of veins help to carry out their function of transporting materials to and from the leaf?

A. The veins are in close proximity to the mesophyll layers which are performing photosynthesis since they contain the chloroplasts. This allows the water to be delivered from the phloem to the cells and the sugars to be carried away from these cells in the xylem with ease and little distance for the materials to be transported before entering these pathways.

B. The veins are in close proximity to the mesophyll layers which are performing photosynthesis since they contain the chloroplasts. This allows the water to be transported away in the phloem from the cells and the sugars to be delivered to these cells from the xylem with ease and little distance for the materials to be transported before entering these pathways.

C. The veins are in close proximity to the mesophyll layers which are performing photosynthesis since they contain the chloroplasts. This allows the water to be delivered from the xylem to the cells and the sugars to be carried away from these cells in the phloem with ease and little distance for the materials to be transported before entering these pathways.

D. The veins are in close proximity to the mesophyll layers which are performing photosynthesis since they contain the chloroplasts. This allows the water to be transported away in the xylem from the cells and the sugars to be delivered to these cells from the phloem with ease and little distance for the materials to be transported before entering these pathways.
(sorry, i know it's a long question :/)