Final answer:
The National Literacy Panel suggests vocabulary expansion is the most effective curricular adjustment for supporting English learners' text comprehension. Complementary strategies like integrating visual aids and building background knowledge also enhance understanding.
Step-by-step explanation:
According to the National Literacy Panel, the curricular adjustment that would most effectively support the literacy development of English learners concerning text comprehension is b) Vocabulary expansion. Expanding vocabulary is crucial because a broader lexicon allows students to understand more complex texts and enhance their comprehension abilities. In addition to vocabulary, incorporating visual aids and contextual knowledge can greatly assist with comprehension, especially when dealing with subjects that are unfamiliar or complex.
Chapter 17 from the provided text discusses the importance of visual literacy along with textual literacy. Visual elements such as images, headlines, and titles offer complementary information that can help in the critical understanding of the text, thereby facilitating better comprehension and retention.
Moreover, prior knowledge of the subject matter, understanding of terminology and genre rules, and proactive strategies like note-taking and questioning can significantly aid in comprehension.