Final answer:
The best experimental setup for testing the hypothesis that the different colors of these flowers are genetically different is option D. Tobias should take home several pink, purple, and blue flowers in pots and breed and interbreed them, observing the results.
Step-by-step explanation:
The best experimental setup for testing the hypothesis that the different colors of these flowers are genetically different is option D. Tobias should take home several pink, purple, and blue flowers in pots and breed and interbreed them, observing the results. This experimental setup allows for controlled breeding and observations of the offspring, which can reveal the genetic basis for the different flower colors.