Consider the following: 1. Untouchability 2. Child Marr

Consider the following:
1. Untouchability
2. Child Marriage
3. Sati
4. Dowry
Which among the above have been prohibited / abolished by the articles in Constitution of India?

[A] 1
[B] 1,2
[C] 1,2,3
[D] 1,2,3,4