Explanation:

- Both rural and urban poverty trends from 1972-73 have been subjects of extensive study in economic history.

- Option 1: Decline

- Historically, many studies and reports have noted a significant decline in poverty rates in both rural and urban areas since the early 1970s.

- Various economic reforms and development programs have contributed to this decline.

- Option 2: Growth

- Growth in poverty would imply an increase in poverty rates, which contradicts the general historical trend during this period.

- Option 3: Increase

- Similar to the above, this does not align with the documented reduction in poverty levels.

- Option 4: None of these

- This option is not correct as significant changes have been recorded.