Story of the dog and 2 crow

Once a dog found a piece of bone. He was eating it sitting under a tree. There sat a crow on the tree. It wished to take away the bone for itself. The crow was very cunning. It flew away. After some time it returned there with another crow. Both the crows went to the dog. One of them with the beak pulled the dog by his tail. The dog felt disturbed and annoyed. Again the crow bit the dog in his tail. The dog got very angry. He dropped the piece of bone on the ground and then looked back to see what the matter was. In the meantime the second crow picked up the bone and flew away with it. The dog ran after the crows but in vain. He was very sad.

Explanation:

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the answer is b and c