Explanation:

- In ancient India, particularly during the period of Mahajanapadas, rulers collected taxes as a form of revenue.

- The tax was typically imposed on agricultural produce, a critical source of livelihood for many.

- There are different historical interpretations regarding the rate of tax imposed by rulers.

1. Option 1: 1/3rd

- This rate is relatively high, representing a third of the produce.

- Not typically associated with Mahajanapadas taxation.

2. Option 2: 1/5th

- Represents a moderate tax but still higher than some known rates.

- Lesser historical evidence suggesting this being a common rate.

3. Option 3: 1/6th

- This is often considered the standard tax rate during the Mahajanapada period.

- Considered a fair share for the state without overburdening farmers.

4. Option 4: 1/4th

- A quarter of the produce represents a substantial tax but could be found in some historical contexts.

- General application in various regions rather than standard for Mahajanapadas.