The correct option is C Starch
The principle way that food is stored in plants is as starch. Starch can
be found in all stems even the main trunk. Starch can be found in those
layers that are many years old as well as those that are still
living. Starch grains are found in the chloroplasts of the higher plants
and if leaves containing starch are kept in darkness for a moderate
amount of time the starch grains will disappear. If these sun deprived
leaves are exposed to light, starch reappears in the chloroplasts. Starch
is the first visible product of photosynthesis. So, the correct answer is 'Starch'.