What is the relationship between vocabulary knowledge and reading comprehension?

• A. The more vocabulary a student knows, the higher their comprehension.
• B. Vocabulary size has no impact on comprehension.
• C. Comprehension determines vocabulary size.
• D. Vocabulary matters only for writing, not reading.

Answer: (A)

Understanding more words helps you grasp what you read more deeply. When a reader knows a wide range of vocabulary, meanings come quickly and accurately, connections between ideas are clearer, and you can infer nuances and relationships across sentences and paragraphs. This reduces the mental effort needed to decode and interpret, so the overall understanding improves.

Research and classroom experience show a strong link between vocabulary size and reading comprehension. In the typical model of reading, decoding prints into words is just the first step; the other independent piece is language comprehension, which includes vocabulary knowledge. As vocabulary grows, a reader can access and integrate ideas more effectively, leading to better comprehension.

That’s why the statement that more vocabulary leads to higher comprehension is the best answer. The idea that vocabulary has no impact, that comprehension determines vocabulary size, or that vocabulary matters only for writing doesn’t fit how reading works in practice, where knowing more words directly supports understanding what you read.