Answer:
Dr. Jones should D. develop and experiment to test her hypothesis and produce data.
Step-by-step explanation:
To explain different observations, scientists use the scientific method, which consists of:
1. Make an observation (in this case, Dr. Jones observes that flowers of the same species express a slightly different shade of red coloring based on where the plants are located within her greenhouse)
2. Review background.
3. Establish a hypothesis (in this case, she hypothesizes that the more sunlight the flowers receive, the darker red the petals of the flower become).
4. Experimental design to test the hypothesis (in this case, this is what she should do).
5. Analyses of the results.
6. If her hypothesis was correct, then she can publish the research; if not, she should establish a new hypothesis and continue to the next step.