Final answer:
The best example of Jackson doing science by inquiry is when he asks himself whether unopened soda cans sink or float and designs an experiment to find out.
Step-by-step explanation:
The best example of Jackson doing science by inquiry is option b) Jackson asks himself whether unopened soda cans sink or float and designs an experiment to find out. This example demonstrates the process of formulating a hypothesis (if unopened soda cans sink or float) and designing an experiment to test that hypothesis. By conducting the experiment, Jackson is engaging in scientific inquiry and gathering evidence to support or refute his hypothesis.