The correct answer is D. Tendu leaves.
Tendu leaves are a nationalized forest product that is collected in Chhattisgarh on support price. The support price is set by the government and is paid to the collectors for every kilogram of tendu leaves that they collect. The support price is intended to ensure that the collectors receive a fair price for their labor and to encourage them to continue collecting tendu leaves.
Tendu leaves are used to make a variety of products, including bidis, cigars, and cigarettes. They are also used in traditional medicine and in religious ceremonies.
Harra is a type of grass that is used to make thatch for roofs. Sal seed is used to make oil and soap. Lakh is a type of resin that is used to make varnish and lacquer.
None of these options are nationalized forest products that are collected in Chhattisgarh on support price.