Final answer:
Coke and limestone are the solid substances fed into the top of a blast furnace for the extraction of iron from iron ore (Option D).
Step-by-step explanation:
In the process of extracting iron from iron ore in a blast furnace, several solid substances are required to be fed into the top of the furnace.
The iron oxides in the iron ore are reduced in the upper region of the furnace by carbon monoxide produced via the reaction with coke.
Additionally, limestone (calcium carbonate) is also added, which decomposes in the middle region of the furnace.
The calcium oxide produced from limestone reacts with silica and silicates in the ore to form ashes, which consists mainly of calcium silicate.
This captures the commercially unimportant components of the ore. Therefore, the solid substances fed into the top of the blast furnace are coke and limestone along with the iron ore.
Hence, the correct answer is Option D) Coke and Limestone.