The types of scale for swimmers' race times can be categorized as follows: B. Ordinal Scale
Swimmers' race times for a 50-meter race across the months of the year represent an ordinal scale. This scale orders the times based on their relative positions, identifying which swimmers perform faster or slower. However, it doesn't quantify the precise intervals between the timings. Unlike an interval or ratio scale, where the differences have meaningful units, an ordinal scale only establishes a ranking.
Therefore, while it's possible to determine the order of performance across the months, the scale doesn't convey the exact quantitative distinctions in time intervals between the races, classifying it as an ordinal rather than an interval or ratio scale.
Option B is the answer.