A average sneeze travels at about 100 miles an hour. Rebecca designs an experiment to increase the speed of sneezes. She subjects four participants to different stimulants: pepper, bright light, pollen, and fizzy soda. While the participant sneezes Rebecca measures how fast air traveled through the nasal passage. What is the control in Rebecca's experiment? A) The four participants B) The different stimulants C) The speed of a typical sneeze D) The speed of the induced sneezes
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