What is the maximum pH level on the pH scale?

The maximum pH level on the pH scale is 14. The pH scale measures the acidity or alkalinity of a solution, with values ranging from 0 to 14. A pH level of 7 is considered neutral, where solutions below 7 are acidic and those above 7 are alkaline (or basic). The value of 14 represents the highest level of alkalinity, indicating a very strong base. Thus, in a practical context, a solution with a pH of 14 would typically demonstrate characteristics of strong alkaline substances. Other options listed do not reflect the upper limit of the pH scale, making 14 the only logical answer in this context.