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Grace wanted to know whether pea plants grow better when placed directly under the sun. Because of this, she designed a simple experiment using two pea plants of the same height. She placed one plant (Plant A) directly under the sun and the other plant (Plant B) in a place where there is indirect sunlight. After a month of observation, she noticed that Plant B is taller than Plant A. Because of this, she concluded that pea plants do not grow better under direct sunlight. Which of the following steps in the scientific method did Grace fail to perform?

A. identify the problem
B. drawing a conclusion
C. testing the hypothesis
D. formulating a hypothesis​