Why is vocabulary instruction considered essential for comprehension?

Vocabulary instruction is considered essential for comprehension because it directly enhances a student's ability to understand texts. When students learn new words, they not only memorize their meanings but also grasp their usage within various contexts. This understanding allows them to connect ideas, infer meaning from the text, and engage more deeply with the material. A robust vocabulary enables students to draw on their knowledge and make sense of what they read, leading to improved comprehension and overall learning.

The other choices do not support comprehension in the same way. Memorizing texts does not contribute to understanding; instead, comprehension relies on the ability to interpret and analyze. Limiting the usage of difficult words may prevent students from encountering challenging vocabulary, which can inhibit their growth and exposure to language. Focusing solely on pronunciation overlooks the importance of understanding word meanings and their applications in reading, which are critical for effective comprehension. Thus, vocabulary instruction is pivotal for building the foundation necessary for profound text understanding.