Concept:The Earth is made of concentric layers, and the innermost layer is the core.
Explanation:The Earth is composed of three main layers based on composition and physical properties.
These layers are the crust, the mantle, and the core.
The crust is the thin, outermost solid layer.
The mantle lies beneath the crust and is composed of hot, semi-solid rock.
The core is the deepest layer, located at the very centre of the Earth.
The core is further divided into the outer core, which is liquid, and the inner core, which is solid.
Because the question asks for the innermost section, the core is the correct answer.
The sial is not a separate main layer; it is part of the crust (the silica-aluminium continental layer).
Answer:C. core