The correct answer is D. Aluminium.
Aluminium is not an important industry of Chhattisgarh from the point of view of production. The main industries of Chhattisgarh are iron and steel, cement, and chemical.
Iron and steel is the most important industry of Chhattisgarh. The state has a number of iron and steel plants, including the Bhilai Steel Plant, the Rourkela Steel Plant, and the Durgapur Steel Plant. These plants produce a variety of iron and steel products, including steel billets, steel slabs, and steel bars.
Cement is another important industry of Chhattisgarh. The state has a number of cement plants, including the ACC Cement Plant, the Dalmia Cement Plant, and the Lafarge Cement Plant. These plants produce a variety of cement products, including Portland cement, white cement, and blended cement.
Chemical is the third important industry of Chhattisgarh. The state has a number of chemical plants, including the Hindustan Unilever Plant, the ITC Plant, and the Reliance Industries Plant. These plants produce a variety of chemical products, including detergents, soaps, and fertilizers.
Aluminium is not an important industry of Chhattisgarh from the point of view of production. The state does not have any aluminium plants.