The correct answer is D. All of these.
The Regional Formula was a proposal for the reorganization of India’s states, based on linguistic and cultural factors. It was adopted by the Indian government in 1956. The Punjabi region, as defined by the Regional Formula, included the following districts:
- Ludhiana
- Amritsar
- Jalandhar
- Gurdaspur
- Ferozepur
- Hoshiarpur
- Kapurthala
- Sangrur
- Patiala
- Bhatinda
- Faridkot
- Mansa
- Muktsar
- Barnala
- Sangrur
- Malerkotla
- Ropar
- Nawanshahr
- Mohali
- SAS Nagar
- Chandigarh
The Regional Formula was based on the assumption that people of the same language and culture should live together in the same state. This was seen as a way to promote unity and harmony among different groups of people. The Regional Formula was successful in creating a number of new states, including Punjab. However, it was not without its critics. Some people argued that it was too simplistic and did not take into account the complex social and political realities of India. Others argued that it created new problems, such as the division of Punjab into two states.
Despite its critics, the Regional Formula remains an important milestone in the history of Indian federalism. It was the first attempt to create a more equitable and just system of state boundaries in India. The Regional Formula also helped to promote unity and harmony among different groups of people.