Which of the following statements is TRUE for degree of disturbance of collected soil sample?

• A. Thinner the sampler wall, lower the degree of disturbance of collected soil sample
• B. Thicker the sampler wall, lower the degree of disturbance of collected soil sample
• C. Thickness of the sampler wall and the degree of disturbance of collected soil sample are unrelated
• D. The degree of disturbance of collected soil sample is proportional to the inner diameter of the sampling tube