Orangutans are long-haired, orange primates that are highly intelligent and closely related to humans. These primates live only within the rain forests in Sumatra, Indonesia, and Borneo, Malaysia. Orangutan actually means "person of the forest" in Malaysian. Orangutans thrive in a forest environment. They spend approximately 90 percent of their days in trees. The trees provide shelter, food, protection, and places to sleep. Additionally, their long arm span allows them to travel within the trees successfully. When an orangutan stands up, their hands actually touch the ground! However, orangutans are critically endangered due to habitat loss. Since these primates only live in a few places and are very dependent on the trees, they are susceptible to human activity, like logging. This is the process of cutting down a mass amount of trees for timber. Deforestation and other human activities have placed this beautiful species in danger of extinction.

Select the sentence from the passage that supports the main idea that orangutans are endangered due to habitat loss.

A. Deforestation and other human activities have placed this beautiful species in danger of extinction.
B. This is the process of cutting down a mass amount of trees for timber.
C. The trees provide shelter, food, protection, and places to sleep.
D. These primates live only within the rain forests in Sumatra, Indonesia, and Borneo, Malaysia.