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a farmer wanted to know if a new brand of fertilizer would be good for his crops. he fertilized all his okra plants with new fertilizer but did not put any fertilizer on his tomato plants. he left the plants in the same condition. his okra did not grew very, well but his tomatoes were big and healthy. he concluded that the new fertilizer was not good. what is wrong with his experiment? the farmer's/farmer___.

A. observation was wrong
B. used two different plants
C. did not use enough okra and tomatoes
D. did not apply enough fertilizer on the okra​