Answer: A=Validate, because energy cannot be created or destroyed but can change forms.
Plants absorbs energy from sun, to prepare their food in the form of carbohydrates by photosynthesis.This chemical energy from food is required by the plants for cellular metabolism. The same process will occur in sea grass.
The law of conservation of energy, says that energy can neither be created nor be destroyed, but it can change it's form. In the given situation, the sunlight energy is converted into chemical energy in plants. Therefore, it can be said that radiant energy from the sun is conserved in the form of chemical energy in sea grass.
Therefore, the results of the experiment, is validate, because energy cannot be created or destroyed but can change forms.