Answer:
The correct answer is option c. "invaluable: having value beyond any ability to adequately appraise".
Step-by-step explanation:
As the student states in the excerpt of the thesis herein shown, the worth of art could not be defined in practical means but on the effect that it has in human spirit. More than trying to give numbers about how costly is to write a book, make a painting or record a song; the worth of art is invaluable as it transcendents time, locations and become part of what define societies and humanity itself. Art has a value beyond any ability to adequately appraise, therefore it's worth is more likely expressed by the word "invaluable".