应该选A吧，意思是David故意告诉她真相，让她恼怒。她因为被好朋友背叛而生气，
选A，意思是David故意告诉她事情的真相来激怒她，这里on purpose是“故意地，有意地”。请采纳。
Daivd told,the truth on purpose to annoy her, and she was angry for being betrayed by her good friend.
