For an app builder who needs to ensure all fields from the page layout are visible on a Lightning Record Page after using the Lightning Object Creator, the correct component to use is:
Record Detail (C). The Record Detail component automatically displays all fields that are included on the assigned page layout for the object. It is designed to reflect the layout configuration and is the simplest way to ensure all fields are presented as configured in the layout editor.
Highlights Panel (A) is used primarily to display key fields at the top of the record page, providing a summary view rather than full field visibility. Recommendations (B) is used for displaying prompts or suggestions and does not display record fields. Path (D) is useful for displaying stages in a process (like sales stages or service processes) and does not show field data directly.
Reference for setting up Lightning Record Pages and using components effectively:
Lightning Record Pages: https://help.salesforce.com/articleView?id=sf.lightning_page_components.htm&type=5