Plz help i am going to fail Which sentence from "Great Gramp" best identifies the central idea of the passage?

A.

Your view of the world is one that is rare and lovely, like a prism, casting rainbow light on the many perspectives of a problem.

B.

Nothing had been the same since.

C.

Cassie boarded the plane, hoping fervently that Gramp hadn't changed.

D.

At seven she had the wisdom of a sage, and everyone who knew her observed this.