单项选择题

It may be inferred that the author would classify which of the following modes of behavior as a referential symbol that originally derived from a condensation symbol

A. Vocalizing inarticulately in order to express rage without using words
B. Writing a pictographic character that vaguely resembles a physical object
C. Flag signaling where the flag movement relies on an existing arbitrary code
D. The use of right-lane highways by general agreement
E. Genuflection to indicate one's willingness to serve in a situation