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13.
Students performed an experiment using Lactobacillus, a bacterium which undergoes lactic acid
fermentation. They exposed the bacteria to several temperatures and recorded the amount of lactic
acid produced. The data is graphed below. According to the graph, at which temperature was the
greatest amount of lactic acid produced?
A. 15°C
B. 20°C
C. 25C
D. 30°C