The sentence which concludes the first paragraph, "Now they knew better", implies that:
Explanation:
As per the first paragraph, Craig and West had thought that mane less lions seen by the amateur observers were adolescents. But once, the scientists saw these lions and saw the colour of their noses, the scientists understood that these were actually adults and that they were mistaken. This eliminates options 1, 2 and 4. Hence, the correct answer is option 3.
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