In South America, wool is obtained from Llama and Alpaca animals.

Explanation:
Llama and Alpaca are two types of animals found in South America that are known for their wool. Let's explore more about these animals and their wool.

1. Llama:
- Llamas are domesticated animals that are native to the Andean region of South America.
- They are primarily bred for their wool, meat, and as pack animals.
- Llama wool is soft, lightweight, and warm, making it suitable for various textile applications.
- The wool comes in different natural colors, including shades of white, brown, and black.
- Llama wool is known for its insulating properties, which help protect the animals from extreme temperatures in the high altitudes of the Andes Mountains.

2. Alpaca:
- Alpacas are also domesticated animals native to the Andean region, particularly Peru, Bolivia, and Chile.
- They are closely related to llamas but are smaller in size.
- Alpacas are mainly bred for their luxurious wool, which is highly prized for its quality and fineness.
- Alpaca wool is known for its softness, warmth, and hypoallergenic properties.
- It comes in a wide range of natural colors, including white, black, brown, and various shades of gray.
- Alpaca wool is used to make a variety of high-quality textiles, including sweaters, scarves, socks, and blankets.

Comparison with other options:
a) Goat and Sheep:
- While goats and sheep do produce wool, they are not specific to South America.
- Goat wool, also known as mohair, is commonly obtained from Angora goats.
- Sheep wool, commonly referred to as wool, is widely produced around the world.

b) Angora Goat:
- Angora goats are primarily bred for their mohair, which is a type of wool.
- However, they are not specific to South America and are found in various regions globally.

d) Yak and Sheep:
- Yaks are primarily found in the Himalayan region of Asia, not South America.
- Sheep wool, as mentioned earlier, is widely produced globally and not specific to South America.

In conclusion, South America is known for obtaining wool from Llama and Alpaca animals. Their wool is highly valued for its quality, warmth, and versatility in textile production.