Which type of communication allows requests and ATC clearances to be displayed to pilots in text form?

Data link communication is the correct choice because it is a method that provides pilots with textual information, including requests and ATC clearances, directly to their cockpit displays. This communication system uses various protocols to send and receive messages electronically, allowing for clear and unambiguous exchange of information.

Unlike voice communication, which relies on spoken language and can be subject to misinterpretation due to accents, background noise, or misunderstandings, data link communication presents information in a visual format that pilots can read. This reduces the likelihood of errors and enhances situational awareness.

Pilot reports and emergency signaling do not encompass the function of providing routine ATC requests or clearances in a text format. Pilot reports are primarily used for sharing information about weather and conditions, while emergency signaling is focused on urgent communication during critical situations, not for routine traffic management.