Final answer:
Students who struggle with comprehension need instruction that develops vocabulary and comprehension, which should include both vocabulary development and comprehension development.
Step-by-step explanation:
Both vocabulary development and comprehension development should be included in the instruction for students who struggle with comprehension. Vocabulary development helps students understand the meanings of words and expand their knowledge of word usage. Comprehension development teaches students strategies to understand and analyze texts, such as making predictions, summarizing, and asking questions. By including both components in the instruction, students can improve their understanding of texts and enhance their overall comprehension skills.