What does fluency in reading mean ?

The correct option is Ability to read a text at ease with expression.

Explanation:

Reading fluency is defined as the ability to read a text accurately, quickly, and with proper expression and phrasing (prosody). A fluent reader can read smoothly at an effortless pace, which allows their brain to focus on comprehending the underlying meaning of the text rather than decoding individual words.

Let's analyze the given options:

1. Ability to read a text at ease with expression: This accurately describes fluency, as it encompasses reading comfortably (at ease) with proper tone, stress, and rhythm (expression).

2. Ability to read a text without any mistake at all: While accuracy is a component of fluency, perfect reading without any errors is not the sole definition of fluency. Fluency focuses on flow and natural rhythm.

3. Ability to interpret the text: This refers to reading comprehension rather than reading fluency itself, though fluency supports comprehension.

4. Ability to read without any grammatical errors: This pertains to language structure and production rather than oral reading fluency.

Therefore, reading fluency means the ability to read text smoothly, accurately, and with proper expression.