Which of the following will be worst affected by Climate Change?

Polar Bears are most threatened by climate change because they depend on Arctic sea ice for hunting seals, their primary prey. As global temperatures rise, sea ice melts earlier and forms later, forcing bears to spend more time on land where they cannot hunt effectively. This has led to declining body condition, reduced cub survival, and population declines. Tigers, Whales, and Dolphins face conservation challenges, but none are as directly and immediately threatened by climate change as Polar Bears.