From my research, the question is 'Which of the following events represented a DISRUPTION in access to the energy source needed by an organism'?
The correct option is this: A CACTUS IS MOVED FROM A SUNNY WINDOWSILL TO A DARK ROOM.
A cactus is a photosynthetic plant, that is, it has the ability to manufacture its own food via the energy obtained from the sun. The sunlight energy is very important to the cactus plant because, without it the plant can not manufacture any food and without food the plant will die. When the cactus plant is moved to a dark room where there is no sunlight that it can use to manufacture food, this will cause a disruption to the plant's access to energy source of sunlight.