The degree of disturbance of the sample collected by the sampler is expressed by a term called the "area ratio". If the outer diameter and inner diameter of the sampler are $D_{o}$ and $D_{i}$ respectively, the area ratio is given by

(A) $\frac{D_{o}^{2}-D_{i}^{2}}{D_{i}^{2}}$

(B) $\frac{D_{i}^{2}-D_{o}^{2}}{D_{i}^{2}}$

(C) $\frac{D_{o}^{2}-D_{i}^{2}}{D_{o}^{2}}$

(D) $\frac{D_{i}^{2}-D_{o}^{2}}{D_{o}^{2}}$

The degree of disturbance of the sample collected by the sampler is expressed by a term called the "area ratio". If the outer diameter and inner diameter of the sampler are $D_{o}$ and $D_{i}$ respectively, the area ratio is given by

(A) $\frac{D_{o}^{2}-D_{i}^{2}}{D_{i}^{2}}$

(B) $\frac{D_{i}^{2}-D_{o}^{2}}{D_{i}^{2}}$

(C) $\frac{D_{o}^{2}-D_{i}^{2}}{D_{o}^{2}}$

(D) $\frac{D_{i}^{2}-D_{o}^{2}}{D_{o}^{2}}$

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