Question: During a space mission, scientists will send experiments for the astronauts to conduct in space. In many cases, scientists have made predictions about the outcome of the experiment. Why do astronauts perform the experiment if the results have already been predicted?

  Options: 
 A. to obtain data to test a hypothesis
 B. to make a complete observation
 C. to make a report of the procedures
 D. to make a hypothesis understandable
Answer: A