Which of the following is an example of alliteration?

AUnder grey stone his voice challenged and resounded clearly. Hate was ignited.

BThe billowing sail blew boldly in the breeze, beating a rhythm that broke the silence.

CThe fire-breather pounced at the sword-bearer, frightening the news-gatherers who were audience to the battle.

DThe click-click-click of the dog's nails as he jogged down the hallway was like a metronome keeping time to the music of the house.