PSYCH 203 Exam 2 November 15th, 2023 Version B 21.A researcher employed a repeated-measures design to investigate the effects of different chemicals on taste perception. What strategy should he employ to curb carryover effects? a. None is needed; the chemicals are all different. b. He should ask participants to consider each taste independently rather than compare them to one another. c. He should counterbalance the order in which participants are exposed to each chemical. d. He should have half the participants be given only one of the chemicals.