Here's the matching of texts and explanations of the bold words:
* Text 1 matches Text C.
* Text 2 matches Text A.
* Text 3 matches Text B.
Explanations of the words in bold:
* hurtful: causing pain or injury.
* rumours: gossip; a story or statement in general circulation without confirmation or certainty as to facts.
* blame: to assign responsibility for a fault or wrong.
* co-operate: to work together.