Arrange the following social legislation in a chronological order

Q. Arrange the following social legislation in a chronological order:

1. Outlawing of the practice of human sacrifice

2. Declaring slavery as illegal in India

3. Caste Disabilities Removal Act

4. Legalising of marriage of widows

(a) 2 1 3 4

(b) 1 2 3 4

(c) 1 2 4 3

(d) 2 3 1 4

Ans: (a) 2 1 3 4