Choose the closest meaning of the word indifference using context clues from the excerpt below:

MOST of them accepted namelessness with the perfect indifference with which they had so long accepted and ignored their names. Whales and dolphins, seals and sea otters consented with particular grace and alacrity, sliding into anonymity as into their element. A faction of yaks, however, protested. They said that “yak” sounded right, and that almost everyone who knew they existed called them that.