You have a colorless solution in a beaker. To identify it you try to see if it will conduct electricity and you find that it does. Next, you place a drop of the solution on some red litmus paper and it doens't appear to do anything. Finally, you put a drop of the solution on some blue litmus paper and it turns red. Which is the best conclusion?
1. This is actually just distilled water.
2. The solution contains a base.
3. The solution is neutral.
4. The solution contains an acid.