The correct options are
A temples
B water wells
C hospitals
D education centers
The so-called Untouchables typically worked in the meat business or were involved in cleaning jobs. People doing such jobs were given the general tag of being an Untouchable. This tag passed on from one generation to the next, irrespective of the individual's aspirations and skill. The Untouchables were not allowed into places considered to be 'pure' and their entry was considered to be 'unholy' and bad by the higher castes.