Option (iii) is correct because the Earth's surface absorbs incoming solar radiation and re-radiates it as infrared heat. Greenhouse gases like CO₂, CH₄, and water vapour then trap this re-radiated heat, preventing it from escaping into space and thereby warming the Earth. Option (i) is incorrect because carbon dioxide does not immediately absorb solar radiation; it absorbs the heat re-radiated by the Earth's surface. Option (ii) is incorrect because while atmospheric particles absorb some incoming radiation, the primary warming of the Earth happens due to the trapping of outgoing heat. Option (iv) is incorrect because the Earth is not heated only by reflected solar radiation; the greenhouse effect is essential for warming.