Nina designed and carried out an experiment about light and plant growth over a specified time period. She displayed her results in the graph shown below. With the teacher’s approval, Robert chose to perform the exact same experiment. What was Robert trying to accomplish? A. Robert is trying to analyze the results of Nina’s experiment. B. Robert is trying to replicate Nina’s experiment. C. Robert is trying to repeat Nina’s experiment. D. Robert is trying to redesign Nina’s experiment.