A good question to use for a scientific investigation should be testable, and it should be connected to science concepts. Casey wants to do a scientific investigation about light. Which of the following questions would be best to use to guide his scientific investigation? A. What color of light is the prettiest? B. Which type of light bulb burns the longest? C. Which type of light bulb is easiest to catch? D. Which type of light bulb is preferred by moms?