No sooner had Fearenside's dog caught sight of him, however, than it began to bristle and growl savagely, and when he rushed down the steps it gave an undecided hop, and then sprang straight at his hand.
Which is the BEST meaning for bristle as it is used in this sentence?
A) soft hair
B) to stand stiffly
C) a tooth in a comb
D) to annoy or irritate