After forming a testable question, a scientist would typically proceed to design an experiment. The purpose of an experiment is to gather data and evidence that can be used to answer the testable question. The design of the experiment involves planning the methods and procedures necessary to conduct the investigation. This includes determining the variables to be tested, developing the materials and tools required, establishing a control group, and specifying the steps to be followed. Once the experiment is designed and conducted, the scientist would then proceed to analyze the collected data, evaluate the outcomes, draw conclusions, and potentially develop a hypothesis based on their findings. Therefore, the correct answer is A. Design an experiment.
