With the increase in the amount of compaction energy A. optimum water content increases but maximum dry density decreases B. optimum water content decreases but maximum dry density increases C. both optimum water content and maximum dry density increase D. both optimum water content and maximum dry density decrease[ES 93]

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The correct answer is C. both optimum water content and maximum dry density increase.

When the amount of compaction energy increases, the soil particles are forced closer together, resulting in a denser soil. This is because the increased compaction energy causes the soil particles to interlock and form a more stable structure. The optimum water content is the water content at which the soil has the highest dry density. As the amount of compaction energy increases, the optimum water content also increases. This is because the increased compaction energy causes the soil particles to become more saturated, and therefore require more water to reach the optimum water content. The maximum dry density is the highest dry density that the soil can achieve. As the amount of compaction energy increases, the maximum dry density also increases. This is because the increased compaction energy causes the soil particles to become more densely packed, and therefore can achieve a higher dry density.

Option A is incorrect because the optimum water content increases as the amount of compaction energy increases. Option B is incorrect because the maximum dry density increases as the amount of compaction energy increases. Option D is incorrect because both the optimum water content and maximum dry density increase as the amount of compaction energy increases.