A strong base typically has a pH value greater than 13. However, among the options you've provided, the highest value that can be considered alkaline but not necessarily classified as a strong base according to the traditional scale is 11.0.
That said, none of the provided options classify as a strong base definitively. Instead, a pH of above 12 would more clearly indicate a strong base, while a pH of 11 indicates a weak base.
To summarize, none of the given pH values can definitively identify a substance as a strong base. If you have to choose from the provided values, 11.0 is the highest and most alkaline presented, but it's weak relative to a stronger base.