Option D: It's mentioned in the lines:
'Bunny rabbit ran to the bear...Bear replied: "I am sorry. I am hungry and tired"...'
Hence, the given lines were said by the bear, and option D is correct.
Option A: The dear didn't say these lines. In fact, he said, "Deer said: "That is right, I can. But now I am busy."
Options B and C: The passage does not contain any speech by the monkey or the goat.
Hence options A, B and C are incorrect.