Here's a problem to solve: A scientist is performing an experiment to determine the melting point of a new substance. Which action could increase the likelihood of obtaining accurate results?

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

- A: repeating the experiment three times
 
- B: experimenting with multiple substances
 
- C: writing out the procedure after the experiment
 
- D: using three types of thermometers in the experiment
 