For a given water content, the application of lower compaction energy increases the dry unit weight of the soil. So, option A holds the correct answer choice.
Compaction refers to a process that brings about an increase in soil unit weight or density, accompanied by a decrease in air volume. There is usually no change in water content. The degree of compaction is measured by dry unit weight and depends on the water content and compaction effort such as weight of the roller, the number of passes, the number of impacts, and weight of the hammer. So when lower compaction energy is put in, it does not have any effect on the dry unit weight of the soil.
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