The statement that best explains why Dalits were considered to be "untouchable" and "unseeable" is: They performed jobs that dealt with contamination and what was considered spiritual pollution.
Dalits, historically known as "Untouchables," were assigned tasks that were regarded as impure or polluting, such as handling dead bodies, cleaning sewers, and other jobs associated with contamination. This view contributed to their social exclusion and the associated stigma within the caste system in India.