The correct answer is option B. "An important idea or refrain". The theme of a story is important to properly label a story and make it easy for the readers to reach it in bookshelves or online. An element that helps to identify the theme of a story is an important idea of the story itself, or a refrain that can give a general summary of what the story is about.
He is shocked and terrified and calls on his family for help. He rushes out of his room to seek help. He determines to continue with his normal work and family relationships.