How Does Auxin Actually Cause Stems to Curve Towards the Light

How does auxin actually cause stems to curve towards the light?

A) In the presence of blue light,auxin triggers additional photosynthesis and growth.
B) In the presence of light,auxin increases the turgor pressure of the cell and accelerates growth.
C) In the presence of light,auxin increases the formation of hydrolytic enzymes that release energy needed for growth purposes.
D) In the presence of light,auxin moves toward the light source and activates a protein that binds to DNA and starts enzyme production.
E) In the presence of unidirectional light,auxin moves to the shady side and activates an ATP-driven proton pump that results in weakened cell walls and eventual elongation.