Answer: Lithification (Option A)
Explanation:
Metamorphic rocks are formed in a different manner, from both igneous and sedimentary rocks. Metamorphic rocks agents form when pre-existing rocks undergo metamorphism which is essentially from high temperature and pressures. The metamorphic agents include the following:
- Heat
- Pressure
- Chemically active fluids so the remaining option is Lithification
Whereas, Lithification is the procedure in which sediments are compressed under pressure and expel connate fluid and then become a rock .