I think the correct answer would be C. It would be restricting water and/or nutrients, instead of supplying ample quantities of both that would not change the results of the experiment. This is because you are still supplying the same amount of nutrients and other things needed by the plant so the ratio of the growth of the plants will still be the same.
The energy not used by an original organism being consumed is being transferred "flowing" to the organism that is consuming the original one, thus being the flow of energy throughout an ecosystem.
Nagging in this situation is shown as a way of exercising social control. Markus's mother had used nagging to enforce social control wherein she nags to make Markus does his homework instead of playing video games. Through, nagging his mother was able to make him comply and conform to what is expected of him to do, which is to do his homework before playing videogames
