Which experiment would most likely contain experimental bias? a. a company that makes pain relief medication tests the effectiveness of their own medicine compared to that of three other brands. b. a chemistry class performs an experiment in which each reaction has the same amount of starting material and begins at the same temperature. c. a student tests the attraction of bees to flowers by placing four different flowers in the same location and counting how many bees visit each. d. a lab performs a test by giving bacterial colonies the same amount of different antibiotics and growing them under the same conditions.