The correct answer is B. Molten
Step-by-step explanation:
Magma refers to melted rock materials or molten materials, these are classified as molten or melted because rock materials are liquified as the result of hot temperatures that can be found under the surface of Earth. Magma can be found under the surface and besides rocks' material it often contains gas and crystals. Additionally, magma is often found withing magma chambers that are specific areas where magma formates and accumulates due to high temperatures. According to this, magma is made of melted materials or molten materials.