Explanation:

- Option 1: 9th Dec 1881

This date is not relevant as the enactment date or coming into force date of the Negotiable Instruments Act.

- Option 2: 1st March 1882

The Negotiable Instruments Act, 1881 came into force on this date.

- Option 3: 9th Dec 1882

This date is incorrect. It does not coincide with any significant date related to the Act.

- Option 4: 1st April 1881

Although this was around the time of the Act's assent, it was not the date it came into force.

The act was enacted on 9th December 1881, but it actually came into force on 1st March 1882.