Q: In this task, you are given a context and four options. Each option is a suggested ending for the context. You should read the context and pick the best ending for the context. Please answer with "A", "B", "C", and "D".
[header] How to classify fractions [title] Point out a proper fraction. [step] In any proper fraction, the numerator is less than the denominator. [substeps] Example : 2/5 every proper fraction expresses a value that is less than 1. <sep> (A) Example : 3/6 next fifth to the numerator. [title] Call genres a fraction, not a denominator. (B) Example : 3/10 every improper fraction expresses a value that is too high. Example : 4/20 every improper fraction expresses a value that is too low. (C) Example : 2/3 every improper fraction expresses a fraction that is too long. Example : 3/8 every improper fraction expresses a fraction that is too short. (D) A proper fraction represents a partial portion of a whole. For example, if there are five books and you read two of them, you have read two out of five books, or two-fifths.
A:
D