Oil Palm Development Programme under ISOPOM includes the following states: Tamil Nadu, Gujarat, and Tripura.

The Oil Palm Development Programme is a government initiative that aims to promote the cultivation of oil palm and increase the production of palm oil in India. The programme is implemented under the Integrated Scheme for Oilseeds, Pulses, Oil Palm and Maize (ISOPOM), which is a sub-scheme of the National Mission on Oilseeds and Oil Palm (NMOOP).

Oil palm is a highly productive crop that yields a significant amount of vegetable oil per unit area compared to other oilseed crops. It is mainly cultivated in tropical regions and is commonly used in various industries such as food, cosmetics, and biofuel production. In India, the major oil palm-growing states are Andhra Pradesh, Karnataka, Tamil Nadu, and Mizoram.

Under the Oil Palm Development Programme, the government provides financial and technical support to farmers for the establishment of oil palm plantations. This includes the provision of quality planting material, subsidies for land preparation, planting, and maintenance, as well as training and capacity building programs for farmers.

The programme aims to increase the area under oil palm cultivation and improve the productivity and quality of palm oil produced in the country. It also aims to reduce the country's dependence on imports of edible oils, as palm oil is one of the major edible oils consumed in India.

Tamil Nadu, Gujarat, and Tripura are among the states that have been included under the Oil Palm Development Programme. These states have suitable agro-climatic conditions for oil palm cultivation and have shown potential for increasing the area under oil palm plantations.

By promoting oil palm cultivation in these states, the government aims to enhance farmers' income, create employment opportunities, and contribute to the overall development of the oil palm sector in the country.

In conclusion, the correct answer is option 'D' - all of the above states (Tamil Nadu, Gujarat, and Tripura) are included under the Oil Palm Development Programme under ISOPOM.