Which feature helps in aligning and sizing objects on a document page?

Rulers are essential tools in document editing as they provide a visual guide along the top and side of the page. They help users determine the exact placement and alignment of objects, such as text boxes, images, and other elements, ensuring that everything is properly positioned. The measurements represented on the rulers facilitate precise alignment, allowing for a more professional layout in documents.

While gridlines and toolbars also support document formatting, their functions are different. Gridlines serve as an additional visual aid for alignment, but they are often used in conjunction with rulers for better precision. Toolbars provide various editing tools and options but do not directly assist in measuring or aligning objects. The concept of pages refers to the physical or digital sheets within a document rather than tools for alignment. Therefore, the most direct and effective feature for aligning and sizing objects is indeed the rulers.