An experiment is conducted with automobile batteries. Thirty batteries are randomly divided into three groups of ten. Each group will be tested at a different temperature: the first at 15°F, the second at 70°F, and the third at 125°F. The batteries' useful life, measured in hours, will be recorded. The same testing mechanism is consistently used throughout the experiment, and the testing sequence is randomized. What are the experimental units? A. The useful life of the batteries B. The batteries C. The testing temperatures: 15°F, 70°F, and 125°F D. The mechanism for testing the batteries

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