Here's a problem to solve: Rolando wants to see at what temperature various liquids boil. He boils tap water and records the temperature. He then boils tap water with milk added and tap water with sugar added. What is the purpose of boiling plain tap water first?

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

- A: to include a factor to manipulate
 
- B: to have a possible explanation to a problem
 
- C: to change one variable while observing the others
 
- D: to provide a standard by which to compare the results
 