Answer:
D. The panther population is not well suited to adapt to any changes in the environment and may become extinct.
Explanation:
According to Darwin's theory of evolution, those organisms survives which are stronger and tolerant to environmental changes. The panther population is decrease because there is no chance of variations in the panther population. It is due to the presence of gene i. e. small and genetically non-diverse. In the end, the panther population becomes extinct.