A. is fluid and can change quickly b. did not exist before 1990c. is practiced only by young people d. discourages innovation or change popular

Things such as religion, ideology, and others are culture and DID exist before 1990 so it is not B, and it is not C because older people have popular culture, and it does not always discourage innovation or change so its not D but it can change quickly like memes and one ancient egyptian pharaoh changed the egyptian religion to be monotheistic instead of a polytheistic religion but as soon as he died the old polytheistic religion became their culture again so its A.

Answerglycogen;