Which of the following lines can be described as conveying the idea that childhood is fleeting?on the “first skating party” poem

A. Dozens of kids circle/the worn wooden floor/on old rental skates (lines 1-3)

B. the simple technique/of steering straight/into the cinder-block barrier (lines 8-10)

C. they know their children/have bones of balsa/and skin that tears/as easily as a napkin (lines 15-18)

D. the ones they love/strobe past them/faster and faster/just beyond their reach (lines 24-27)