The primary benefits of constructing a narrative with multiple plot lines are best represented by options B and D:
B. It helps the story be more complex - Multiple plot lines can add depth and intricacy to a story, allowing for different themes, conflicts, and character arcs to be explored simultaneously. This complexity can enhance the reader's engagement and investment in the narrative.
D. It helps the story have more rounded characters - With multiple plot lines, there is often more opportunity to develop characters through various situations and interactions. This can lead to more well-rounded and multifaceted characters, as their responses to different circumstances can reveal various aspects of their personalities.
While option A might be true in some cases, it's not a guaranteed benefit, as multiple plot lines can sometimes confuse rather than clarify a story. Option C is more about stylistic choices rather than directly related to the benefits of multiple plot lines.