Why is realism said to be a reaction to romanticism?

AUnlike the romantics, realists chose to glorify topics such as war.

BUnlike the romantics, realists chose to use figurative language.

CUnlike the romantics, realists chose to write about beauty over sentimentality.

DUnlike the romantics, realists chose to write about kings and noblemen.

EUnlike the romantics, realists chose to use real-life situations over idealism.