What information must be marked near fuel filler openings for normal category aircraft?

Markings near fuel filler openings on normal category aircraft are crucial for ensuring safe and correct refueling practices. The requirement to display the word "fuel" along with the minimum fuel grade provides clear guidance for anyone refueling the aircraft. This labeling helps prevent the potential hazards associated with using an incorrect fuel type, which can lead to severe damage to the engine or other components.

Including the word "fuel" serves as a general identifier for the location, while stating the minimum fuel grade ensures that only fuel that meets the aircraft's specific requirements is used. This helps maintain operational safety and prevents accidents due to fuel misidentification.

The other options lack essential elements that enhance safety and clarity for those refueling the aircraft. By emphasizing both the word and the minimum grade, the correct approach effectively communicates both purpose and safe handling practices.