Answer:
Introduction:
The question is asking which rocks are known as fiery rocks. We need to identify the correct option from the given choices and provide a detailed explanation for our answer.

Igneous Rock:
- Igneous rock is formed through the solidification of molten material, either magma or lava.
- It is referred to as fiery rock because it forms from the cooling and solidification of hot, molten material.
- Igneous rocks are often associated with volcanic activity and are characterized by their crystalline structure.
Sedimentary Rock:
- Sedimentary rock is formed through the deposition and compaction of sediment layers over time.
- It is not known as fiery rock because it does not form from the cooling and solidification of molten material.
- Sedimentary rocks are typically composed of fragments of other rocks, minerals, and organic material.
Metamorphic Rock:
- Metamorphic rock is formed through the transformation of pre-existing rocks by heat and pressure.
- It is not known as fiery rock because although it is formed under high temperatures and pressures, it does not involve the solidification of molten material.
- Metamorphic rocks often exhibit foliation, which is a layered or banded appearance due to the reorientation of minerals during the metamorphic process.
Conclusion:
Based on the above explanation, the correct answer is option A: Igneous rock. Igneous rocks are known as fiery rocks because they are formed from the cooling and solidification of hot, molten material. Sedimentary and metamorphic rocks do not involve the solidification of molten material and are not known as fiery rocks.