【单选题】

Space permitting, legends shall be spelled out within the diagram rather than abbreviated by numerals to a list of legends at the bottom or on an adjacent pagE.

A、It is permitted to show the legends within the diagram instead of listing at the bottom or on an adjacent page by the abbreviation number.
B、Legends shall be explained in a simple way within the diagram at the bottom or on an adjacent page except for abbreviation with numbers in a list.
C、If the space is enough, the legends shall be stated within the diagram and do not list them by numerical abbreviations at the bottom or on an adjacent pagE.