Which statement was provided by Julius Von Sachs?

• A
  He proved that air is required for plant growth.
• B
  He proved that in bright sunlight,small bubbles were formed around the green parts in aquatic plants.
• C
  He found that the green parts in plants are where glucose is made and that the glucose is usually stored as starch.
• D
  It represents that $O_2$ is released from $H_2O$ and not from $CO_2$.