What makes high-density polyethylene denser than low-density polyethylene based on their molecular structure?

• A. High-density polyethylene is denser due to its heavier longer unbranched chains
• B. High-density polyethylene is denser due to its longer, unbranched chains that can fit closer together.
• C. High-density polyethylene is denser due to its longer, unbranched chains that does not fit closer togther
• D. High-density polyethylene is denser due to having more chains than low-density polyethylene