A horticultural research agency is trying to optimize the growth of the grass in an area for a new project. They are interested in the relationship between the amount of fertilizer used (measured in kg) and the amount of grass grown (measured by weight, in kg). Which of the following is the best choice for the response variable? Answer Choices: a. The difference between the weigh of the grass and the weight of fertilizer. b. The cost of the fertilizer. c. The amount of grass grown

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