**Core Concept**
The elastic modulus and tensile strength of dental amalgam are critical properties that determine its ability to withstand occlusal forces and last for an extended period in the oral cavity. Dental amalgam is a mixture of mercury with silver-tin alloys, which provides its unique mechanical properties.

**Why the Correct Answer is Right**
The elastic modulus of dental amalgam is approximately 15-20 GPa, which is relatively low compared to other dental restorative materials. This characteristic allows dental amalgam to undergo elastic deformation under occlusal forces, thereby distributing stress over a larger area and reducing the likelihood of fracture. The tensile strength of dental amalgam is around 50-100 MPa, which is sufficient to withstand the forces exerted during mastication. The combination of low elastic modulus and moderate tensile strength makes dental amalgam a suitable material for restoring posterior teeth.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not provide any information about the elastic modulus and tensile strength of dental amalgam.
**Option B:** This option is incorrect because it is not a valid value for the elastic modulus and tensile strength of dental amalgam.
**Option C:** This option is incorrect because it is not a correct comparison to other dental restorative materials.

**Clinical Pearl / High-Yield Fact**
It's essential to note that the addition of copper to dental amalgam can significantly improve its corrosion resistance and durability. However, the inclusion of copper can also affect the material's color and potentially cause discoloration of the surrounding tooth structure.

**Correct Answer:** C.