The light reactions stage occurs before the Calvin cycle , requires light energy to work and releases oxygen through the stomata.
Answer: D) all the above
Explanation
The light reactions stage is one of the two stages which occur during the chemical reaction of photosynthesis.
It is the first stage and second stage is Calvin cycle. So the first option is true which states that the light reactions stage occurs before the Calvin cycle.
In light reactions stage, the light energy of sun is captured by the chloroplast and this energy is the main trigger for starting the light reaction stage between the reactants carbon-di-oxide and water.
So the second option is also true i.e., the light reactions require light energy to work.
In light reaction stage, the water molecules will release oxygen gas from the stomata.
Thus all the options are true for light reactions stage in photosynthesis.