Which of the following is not a cause of issue between India and Bangladesh?

Disaster management and environmental issues

The governments of India and Bangladesh have had differences over several issues including the sharing of the Ganga and Brahmaputra river waters. The Indian government has been unhappy with Bangladesh’s denial of illegal immigration to India, its support for anti-Indian Islamic fundamentalist groups, Bangladesh’s refusal to allow Indian troops to move through its territory to northeastern India, and its decision not to export natural gas to India or allow Myanmar to do so through Bangladeshi territory. Bangladeshi governments have felt that the Indian government behaves like a regional bully over the sharing of river waters, encouraging rebellion in the Chittagong Hill Tracts, trying to extract its natural gas and being unfair in trade.
Despite the many differences, on disaster management and environmental issues, the two states have cooperated regularly.