The correct option is C Habitat fragmentation
The giant pandas live in the mountain ranges of the Sichuan, Shaanxi and Gansu provinces in China, 8000 ft above sea level, where the bamboo forests that are essential for the panda’s nutrition are found. The giant panda’s habitat once spread across central, southern and eastern China, and China’s neighbouring countries of Myanmar and northern Vietnam. But in the last 200 years, it has dwindled to about 20 isolated patches due to heavy deforestation, and conversion to farm lands. Habitat fragmentation threatens these animals, because they live in a rather harsh habitat. A particularly severe winter can spell doom to the animals in various patches, if they are not connected together and cannot migrate easily from one place to another. Another reason why fragmentation is particularly challenging in the case of the pandas, is their behaviour. These animals are highly solitary, requiring very large territories for foraging. They are not tolerant of other animals in their territory and their only encounter with other pandas is during the brief mating period. Thus these animals require very large regions that are interconnected for the survival of their species.