Explanation:

- Option 1: 1929

- In 1929, the Child Marriage Restraint Act was introduced in India, but it was not related to sati.

- Option 2: 1977

- There were no specific laws related to sati passed in 1977. This was a period of political change in India, but not related to the legislation on sati.

- Option 3: 1887

- 1887 was during the British colonial rule, and while social reforms were discussed, no significant legislation on sati was introduced.

- Option 4: 1987

- Correct Option: The Commission of Sati (Prevention) Act was indeed passed in 1987 following a widely publicized incident. This act aimed to prevent the practice of sati and penalize any glorification of it.