The correct answer is: d) All of the above
Encroachment is the act of building or occupying land that does not belong to you. This is a major problem in Assam, where many archaeological sites are located on land that is now being used for agriculture or development. This can damage the sites and make it difficult for archaeologists to study them.
Lack of maintenance is another major problem facing archaeological sites in Assam. Many of these sites are not well-protected and are at risk of being damaged by natural disasters or human activity. This can lead to the loss of important historical information.
Limited funding for conservation is also a problem. Conserving archaeological sites is expensive, and there is not enough money available to do this properly in Assam. This means that many sites are not being properly protected and are at risk of being lost forever.
All of these problems are serious and need to be addressed if we want to protect the archaeological heritage of Assam.