Because they create multiple alleles, mutations can cause A. cell division.
B. damaged DNA to repair itself.
C. overproduction of offspring.
D. variations in traits.

The best answer is B.

An animal like the Llama lives in high altitudes from 7,400 to 12,800 meters above sea level.

When compared to other animals, Llamas have a lot more red blood cells per unit than other animals. More red blood cells mean more hemoglobin.

When hemoglobin combines with oxygen, oxyhemoglobin is formed. Thus oxyhemoglobin in Llamas is greatly increased  than in most other animals and  the Llamas are able to thrive in high altitude  areas where oxygen is thinner.