Upon Exposure to Blue Light, Plants Not Only Begin to Grow

Upon exposure to blue light, plants not only begin to grow toward the light, but move their chloroplasts to the sunny side of each cell. Why would it be advantageous to move chloroplasts within cells?

A) moving chloroplasts is not advantageous because it requires an input of energy
B) to maximize light absorption by the chloroplasts for photosynthesis
C) to maximize heat absorption by the chloroplasts for cellular respiration
D) to add weight to the sunny side of the plant so the plant will bend
E) to reduce stomatal opening on the sunny side of the plants