Here's a problem to solve: If an experiment results in data that do not support the hypothesis, what is the most likely step to take next?

Among the 4 following options, which is the correct answer?

- A: Change the data to support the hypothesis.
 
- B: Perform the experiment without using control groups.
 
- C: Make observations and form another testable hypothesis.
 
- D: Perform the experiment using a larger number of variables.
 