Select the correct statement. A. More the value of group index, less thickness of pavement will be required B. More the value of CBR, greater thickness of pavement will be required C. Minimum and maximum values of group index can be 0 and 20 respectively D. All of the above

The correct answer is D.

Group index (GI) is a measure of the soil’s ability to support a pavement. It is determined by a laboratory test that measures the soil’s strength and drainage characteristics. The higher the GI, the better the soil’s ability to support a pavement.

CBR, or California Bearing Ratio, is a measure of the soil’s ability to support a load. It is determined by a field test that measures the soil’s resistance to penetration. The higher the CBR, the better the soil’s ability to support a load.

The thickness of a pavement is determined by the soil’s GI and CBR. The higher the GI and CBR, the less thickness of pavement will be required.

Therefore, all of the statements are correct.