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Official Explanation

Examine only the beginning and ending weights for all three animals. For the cat and hamster the difference between the original and final weights was less than 2 kg. For the dog, the initial weight was a little more than 10 kg, while the final weight was a little more than 8 kg. The dog’s weight changed by \(10 – 8 = 2 kg,\) which is the greatest change for the three animals.

Answer: C