What type of information is provided in Block 20?

Block 20 in an ATC flight plan is designated for altitude information, specifically noting the altitude in hundreds of feet. This block provides vital information for air traffic controllers as it helps in maintaining safe vertical separation between aircraft and ensures efficient management of airspace. Accurate altitude reporting is crucial for ensuring that all aircraft are aware of their relative positions in the vertical dimension, which is essential for safety and coordination in busy airspaces. The other choices pertain to different types of information not specifically associated with Block 20. For instance, pilot estimated time over fix would fall under different blocks that deal with timing and navigation data, while miscellaneous information and points of origin pertain to other aspects of flight planning and operations.