“dalit [untouchable] families forbidden to use
public water-tap”
“nepal bans bias against untouchables in move to
end hindu caste system”
these headlines reflect a conflict between
(1) traditional customs and modern law
(2) child labor and industrialization
(3) national self-determination and ethnic diversity
(4) access to resources and forced migration

These headlines reflect a conflict between traditional customs and modern law. The correct option among all the options that are given in the question is the first option or option "1". The caste system was the custom of the Hindus that had continued for a long time, only law could have banned this system.

when you crush an ice cube you caue a physical change