Correct Response: B. Reading fluency is the ability to read a text accurately, at an appropriate rate, and with appropriate expression. Hence, key indicators of reading fluency development are accuracy, rate, and prosody, with accuracy and rate being the two indicators most commonly assessed on fluency measures. A is incorrect because the types of texts a reader prefers and the reader's motivation are not indicators of fluency development. A reader can be motivated to read but still lack the decoding skills necessary to be able to read fluently. C and D are also incorrect because fluency is prerequisite for reading comprehension, not vice versa.
