Ruben has a new puppy and wants to feed it the best possible food. He decides on an experiment where he will feed it the very best canned food + a dietary supplement of vitamins recommended by a veterinarian. Which of the following best describes Ruben's project?A. This is an example of an excellent, controlled experiment as it is written. B. Ruben needs to take careful measurements for it to be a good experiment. C. Ruben needs to control for the amount of exercise that the puppy gets each week. D. This is not an experiment—there are no controls, constants or replicates. This is just an idea.

D. This is not an experiment-there are no controls or replicates.

Explanation:

An ideal experiment requires the environment for conducting the experiment, a control sample which is kept undisturbed and receives no treatment, an independent variable the effect of which is to be observed on the test samples or experimental variables.

In the given situation, the dependent variable is undefined, and there is no control sample is kept among the three materials given as a food source. The experiment is also not repeated to assure the results of the food materials on the puppy. Thus this can be said that the given situation is not an experiment.