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Which sentence is an opinion?
A. "Chimpanzees groom each other to show affection."
B. "Dogs also bark, whine, growl, and howl to communicate."
C. "For example, when male white-tailed deer rub their antlers against trees, glands on their heads leave a scent behind."
D. "In these kinds of animal conversations, half the fun is in trying to figure out what the animals are saying to each other!"
What is D. "In these kinds of animal conversations, half the fun is in trying to figure out what the animals are saying to each other!"