The correct answer is (a). According to the 2011 Census, 20% of households in India still use firewood for cooking. This is a significant decrease from the 35% of households that used firewood for cooking in 2001. The decline in the use of firewood for cooking is due to a number of factors, including the increasing availability of electricity and LPG, the government’s efforts to promote clean cooking, and the rising cost of firewood.
Option (b) is incorrect because it is too high. The 2011 Census found that only 20% of households in India still use firewood for cooking.
Option (c) is incorrect because it is too low. The 2011 Census found that 20% of households in India still use firewood for cooking.
Option (d) is incorrect because it is too high. The 2011 Census found that only 20% of households in India still use firewood for cooking.