B. You are developing a landing page for people managers only.
This describes adding a new, role-specific landing page. It does not provide a reason to remove an existing one; other pages would likely remain for other user roles.
C. You are developing a new landing page for all users.
This involves creating a new page, which might coexist with other landing pages. It does not inherently require the removal of an existing page unless it is a direct replacement.
D. You are developing a landing page not in the main menu by default.
This is a configuration choice for a new page's visibility. A landing page can be functional and necessary without being in the main navigation menu.