Which statement is true? o a. a hypothesis must be based on the researcher's analysis of the data collected in the experiment. o b. a hypothesis must be testable for it to be useful in scientific research. o c. a hypothesis must be supported by the results of the research study.

Consider the following planned experiment. factor experimental group control group light exposure tots of sun tots of sun amount of water weekly weekly type of soil nutrient rich nutrient rich size of pot large which variable is being tested in this experiment? small a. size of pot b. type of soil c. light exposure d. amount of water