Read the following passage and answer the question that follows.

The lovely thing about the unsayable is that it is unsaid. As soon as it is said, it is sayable and loses all its mystery and ambiguity. Art exists so that the unsayable can be said without having to actually say it. We cloud it in secrecy and obfuscation. The mind is free to roam and all things can be imagined, under the cover of darkness. How nice that is. The unsayable. How tired we are of having things explained to us. Having things said. How nice it is when people just shut … up."

Which of the following options can be BEST inferred from the passage?

Let us understand what the passage is trying to convey, 
We see that the first line talks about the beauty of unsaid things, the author is trying to emphasize the charm of unsaid things and how that charm is lost when it spoken out by stating that it loses all mystery and ambiguity when it is said out loud. 
They then bring in the idea of art, and how art acts as a tool that can convey ideas and thoughts without saying it. 
They mention that it is clouded in secrecy and obfuscation and the fact that the interpretation of a piece of art lies in the eyes of the beholder. 
They conclude by stating the beauty of unsayable things and how things are better when they are left unsaid. 

After understanding the passage, taking a look at the options we see that
Art echoes the language that is unintelligible can be eliminated as it is out of context and brings in the idea of intelligence out of nowhere. 
Explaining an art metamorphoses into another piece of art can be eliminated too as this actually goes against what the author is trying to convey; by explaining the art you are tainting the beauty of the art according to the author. 
Any piece of art defies expression this too is wrong as it defies the author, the author clearly states that art expresses things while leaving it unsaid. 
Art unfolds the mystery of human tongues, this option emphasizes on the human tongue over the beauty of unsaid things and the charm of art, which cannot be inferred. 

Art expresses what humans cannot communicate in words, this can be inferred as the author talks about the beauty of art as it can convey unsaid thoughts and ideas.