The specific stiffness of a material is defined as the ratio of

Correct option is C

​$$\begin{aligned}&\textbf{Specific stiffness} \text{ is a material property commonly used in } \\&\text{aerospace, automotive, and lightweight structural applications,} \\&\text{where weight is critical.} \\[1em]&\text{It is defined as:} \\&\boxed{\text{Specific stiffness} = \frac{E}{\rho}} \\[1em]&\text{Where:} \\&\bullet\ E = \text{Young's Modulus (Elastic Modulus)} \quad (\text{N/m}^2) \\&\bullet\ \rho = \text{Density of the material} \quad (\text{kg/m}^3)\end{aligned}$$​​