C. Drought is not likely to be limiting factor on the other sea otter population.
In general, Humans are considered as the biggest threat to sea otter populations. Humans effect their population, through shootings, fishing gear entanglements and boat strikes, take a toll on sea otters, but oil spills, pollution, disease and loss of kelp pose major threats.
Hence, main reason of decline in sea otter population is the result of interactions with other species, including humans. This includes predators, prey, and competition from other species, parasitic infection and changes in environment mainly due to human interaction.
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