Amber, which is made from hardened tree resin is a gem. Although amber is often used in jewelry it is not mineral. Which statement explains why amber is not a mineral?

A. It is not solid
B. It is not valuable
C. It is not natural
D. It is not inorganic

D. It is not inorganic

The correct answer is D. It is not inorganic.

To understand why amber is not a mineral, we need to understand the definition of a mineral. A mineral is a naturally occurring, inorganic solid with a specific chemical composition and a crystalline structure.

Amber, on the other hand, is formed from the hardened resin of ancient trees. It is organic in nature because it originates from a living organism, and it is not classified as a mineral because it does not meet the criteria of inorganic solid.

Therefore, option D, which states that it is not inorganic, correctly explains why amber is not a mineral.