**Explanation:**

The Earth is composed of several layers, each with distinct characteristics and properties. These layers are classified into three main divisions: the crust, the mantle, and the core.

1. **Crust:** The crust is the outermost layer of the Earth. It is the thinnest layer and is made up of solid rocks and minerals. The crust can be further divided into two types: the continental crust, which forms the continents and is composed mainly of granite; and the oceanic crust, which forms the ocean floor and is composed mainly of basalt.

2. **Mantle:** The mantle is the layer that lies beneath the crust. It is divided into two main sections: the upper mantle and the lower mantle. The upper mantle is solid but can flow slowly over long periods of time, and the lower mantle is solid and more rigid. The mantle is composed of dense, solid rock and extends to a depth of about 2,900 kilometers.

3. **Core:** The core is the innermost layer of the Earth. It is divided into two parts: the outer core and the inner core. The outer core is a liquid layer composed mainly of molten iron and nickel. It surrounds the solid inner core, which is composed mostly of iron. The core is the hottest part of the Earth, with temperatures reaching up to 6,000 degrees Celsius.

Based on the above information, it can be concluded that option **C) Molten** is not a layer of the Earth. The term "molten" refers to a state of matter, specifically a liquid state resulting from the heating and melting of a solid material. While the outer core of the Earth is indeed composed of molten material, it is not considered as a separate layer but rather as part of the core itself. Therefore, the correct answer is option C) None of these.

C. Molten.