Final answer:
The list of books read by your friend is categorical and classified by names, which makes the data set's level of measurement nominal, where the data cannot be ordered or used in calculations.
Step-by-step explanation:
The data set provided lists books that your friend read over the past five months. This type of data is categorical and the names of the books serve as labels or names, making it nominal in terms of the level of measurement.
There is no inherent order, numerical value, nor can these data entries be meaningfully added, subtracted, or divided to produce a ratio. Therefore, the data set's level of measurement cannot be ordinal, interval, or ratio, since the differences between data entries are not meaningful, there is no inherent zero, and no meaningful ratios can be calculated.
Based on this analysis, the correct answer is option B. Nominal. The data set is categorized using names, labels, or qualities but the data cannot be ranked or arranged in order. The list of books falls squarely into this category as it merely identifies the different books read without any qualitative or quantitative ranking or order.