Mustard Plants Were Grown Under 16 Hours (Hour 0 to 16)

Mustard plants were grown under 16 hours (hour 0 to 16) of light followed by 8 hours (hour 16 to 24) of dark for several weeks.Leaves were then excised at different times during a single 24-hour cycle and measured for mass before starch content was determined.The graph below summarizes the results of these analyses, showing starch content expressed as starch mass per leaf mass. These data provide evidence to directly support which statement about starch that is formed as the result of photosynthesis in plants?

A) Starch is a polymer of glucose and in plants serves as a storage form of carbohydrates generated during photosynthesis.
B) Starch is stored within chloroplasts in the form of granules, which can be observed using microscopy techniques.
C) Starch stored within a plant's leaves provides a source of chemical energy for the plant at night when its light reactions do not occur.
D) Starch and sucrose are formed from glyceraldehyde 3-phosphate, each of which requires three molecules of carbon dioxide to be fixed by rubisco.
E) Starch is stored in roots, seeds, and fruits of a plant in addition to its storage in a plant's leaves.