Over time, abstract art has become a recognized and valued part of art history. this is an example of:
a- deterioration of artistic standards.
b- changes in artistic style over time
c- different interpretations of what makes good art.
d- the way fads come and go.

that is an example of : B. changes n artistic style over time. Most of the time, the trending art will pretty much reflect the current condition of society in which the artists are currently in. back then, many artists got their inspiration from unexplainable vision from their enlightment

Idon’t think it’s true but if it is then you should make up a case then prove it