Which statement about the nutritional needs of lice is true?

Lice require human blood to live because they are obligate ectoparasites, meaning they depend on a host for their survival. Their primary source of nutrition comes from the blood of their human hosts, which they ingest by piercing the skin with their specialized mouthparts. This requirement for blood is essential for their growth, reproduction, and overall health. Without access to blood, lice cannot survive, making this statement accurate.

The other options suggest different feeding behaviors that do not align with the biological needs of lice. For instance, while lice may affect the skin, they do not feed on skin cells or hair, which further clarifies the necessity of blood for their nutritional needs.