In his "Ode on a Grecian Urn," John Keats attempts to understand and describe

A: The origin of life
B: The nature of beauty
C: The purpose of death
D: The meaning of passion

B: The nature of beauty

In "Ode on a Grecian Urn," John Keats explores the concept of beauty and its eternal nature as depicted on the urn. He contemplates the idea of beauty being frozen in time, unaffected by the passing of time or the imperfections of human life. Keats discusses how the beauty captured on the urn transcends the limitations of mortal existence, leading to a deeper philosophical reflection on the nature of beauty itself.