Final answer:
The most appropriate strategy to promote second-grade students' ability to analyze key ideas and details in a literary text is helping students create a story map of the main characters and events.
Step-by-step explanation:
The most appropriate strategy to promote second-grade students' ability to analyze key ideas and details in a literary text would be option C: helping students create a story map of the main characters in a story and the events with which they are involved. Story mapping is a visual tool that helps students understand the main elements of a story, including characters, events, and their relationships. By creating a story map, students can analyze key details and identify the main ideas of a literary text.