The given information doesn't provide any details about the pH or any other properties of the solution. However, we can make an inference based on the concentration of the solution.
A 1.0 M solution is a relatively high concentration. In general, strong acids and bases are more likely to have high concentrations, while neutral substances are less likely to have such high concentrations.
Therefore, it is possible that the solution is either acidic or basic, but it is unlikely to be neutral.
Without further information about the pH or any other properties of the solution, the best answer choice is (D) Not enough information to answer the question.