A fourth-grade teacher wants to help students build their knowledge of content-specific vocabulary words to support their comprehension of grade-level science and social studies texts. Which of the following strategies would be most effective for this purpose?

A. having students select correct words from a given text to complete sentences in fill-in-the-blank exercises
B. guiding students in creating a graphic organizer to visually represent relationships between the key words in a given text
C. instructing students to stop and write down unfamiliar words in a personal word bank as they encounter them in a given text
D. providing vocabulary lists that include definitions of key words from given texts as a home study aid for students