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Which of the following best combines sentences 9 and 10 (reproduced below)?
Other scientists are skeptical. They say that it is not possible to prove that animals feel emotion using any
standard, controlled scientific methods.
Although they say that it is not possible to prove that animals feel emotion using any standard, controlled
scientific methods, other scientists are skeptical.
O Other scientists are skeptical; moreover, they say that it is not possible to prove that animals feel emotion
using any standard, controlled scientific methods.
O Other scientists are skeptical, saying that it is not possible to prove that animals feel emotion using any
standard, controlled scientific methods.
O It is not possible to prove that animals feel emotion using any standard, controlled scientific methods, some
scientists say, although they are, admittedly, skeptical.