Applying this to the given diagram, we will find that marble is most likely formed in position C
Marble is a metamorphic rock that forms from the metamorphism of limestone, a sedimentary rock. The process involves the recrystallization of the minerals in the original limestone, often due to heat and pressure. This typically occurs deep within the Earth's crust.
Referring to the attached image below which represents the complete rock cycle, we will find that a marble can be formed when hot magma is cooled and crystallized. Applying this to the given diagram, we will find that marble is most likely formed in position C