The correct answer is option 'C' - 8.

Explanation:
- In India, the proportion of irrigated area varies across different states depending on factors such as availability of water resources, topography, and agricultural practices.
- To determine the number of Indian states with a high proportion of irrigated area, we need to consider the states where a significant portion of agricultural land is irrigated.
- Some states in India have a higher proportion of irrigated area compared to others due to factors like river systems, canals, reservoirs, and groundwater availability.
- Let's analyze the irrigated area in each state to determine the correct answer:

1. Punjab:
- Punjab is one of the leading states in terms of irrigation.
- It has a well-developed canal irrigation system, and a high proportion of agricultural land is irrigated.
- Therefore, Punjab is one of the states with a high proportion of irrigated area.

2. Haryana:
- Haryana also has a significant proportion of irrigated area.
- It is primarily dependent on canal irrigation from the Western Yamuna Canal and the Bhakra Canal.
- Therefore, Haryana is one of the states with a high proportion of irrigated area.

3. Uttar Pradesh:
- Uttar Pradesh has a large agricultural sector and a significant proportion of irrigated area.
- It is well-served by canal irrigation systems, including the Lower Ganges Canal, Upper Ganges Canal, and the Yamuna Canal.
- Therefore, Uttar Pradesh is one of the states with a high proportion of irrigated area.

4. Punjab:
- Rajasthan has made significant efforts to increase irrigation facilities in recent years.
- Through initiatives like the Indira Gandhi Canal, Rajasthan has increased its irrigated area.
- Therefore, Rajasthan is one of the states with a high proportion of irrigated area.

5. Gujarat:
- Gujarat has a relatively high proportion of irrigated area due to its extensive canal network and the Narmada River.
- Many areas in Gujarat receive irrigation water from the Sardar Sarovar Dam on the Narmada River.
- Therefore, Gujarat is one of the states with a high proportion of irrigated area.

6. Andhra Pradesh:
- Andhra Pradesh has a considerable proportion of irrigated area.
- It has several major river systems, including the Godavari and Krishna rivers, which provide water for irrigation.
- Therefore, Andhra Pradesh is one of the states with a high proportion of irrigated area.

7. Telangana:
- Telangana, a newly formed state, also has a significant proportion of irrigated area.
- It is mainly dependent on irrigation from the Godavari and Krishna rivers.
- Therefore, Telangana is one of the states with a high proportion of irrigated area.

8. Tamil Nadu:
- Tamil Nadu has a well-developed irrigation infrastructure, including reservoirs and canals.
- It has a high proportion of irrigated area, especially in the Cauvery Delta region.
- Therefore, Tamil Nadu is one of the states with a high proportion of irrigated area.

Based on the analysis above, we can conclude that there are 8 Indian states with a high proportion of irrigated area. Therefore, option 'C' is the correct answer.