Final answer:
The best metacognitive strategy for a student dealing with unknown vocabulary in a novel is using context clues and knowledge of affixes to infer meanings, complemented by strategies like annotating the text and maintaining a reading journal.
Step-by-step explanation:
When a fifth-grade student encounters many unfamiliar vocabulary words in a novel, the best metacognitive strategy to suggest would be B. Using context clues and knowledge of affixes. This technique involves looking at the words around the unfamiliar term, as well as prefixes, suffixes, and root words, to infer the meaning.
Other strategies mentioned, such as making notes in the margins, completing a self-created graphic organizer, or rereading the text, can all support this primary method and improve comprehension of the novel overall.
Additionally, annotating the text and keeping a reading journal are valuable practices that encourage students to engage actively with the material they are reading and reflect on it, thus improving their metacognitive skills and comprehension.