Giant pandas were once critically endangered, with their population dwindling due to habitat destruction and low birth rates. Scientists and conservationists became very concerned about their future. In recent decades, however, significant conservation efforts have been made. These efforts include establishing large nature reserves, protecting bamboo forests which are their primary food source, and implementing successful breeding programs in zoos. As a result, the population of giant pandas has slowly started to increase, moving them from 'endangered' to 'vulnerable' status.
Which of the following actions helped the giant panda population increase?
A) Destroying their habitat
B) Having low birth rates
C) Protecting bamboo forests and establishing nature reserves
D) Moving them to human settlements