What distinguishes block texts in page formatting?

Block texts in page formatting are distinguished primarily by their indentation and the use of different font sizes or typefaces. This formatting approach typically involves aligning the text in a way that visually separates it from the surrounding content, making it stand out effectively. Indentation creates a clear visual cue that indicates a shift in focus, often used for paragraphs or quotes. Additionally, varying the font size or typeface can further emphasize the block text, providing a hierarchical structure that guides the reader's attention.

This formatting is particularly useful for enhancing readability and organizing content, helping to convey information more clearly. The other choices involve different techniques that may enhance visual appeal or provide emphasis but do not specifically identify what characterizes block texts in terms of page layout. For instance, bold letters can add emphasis to specific words or phrases, while colors and backgrounds can improve aesthetic appeal. However, these features do not define the core attributes of block text. Similarly, the placement of images serves different functions within a layout and does not relate to the characteristics that make block text distinct.