Which statement correctly distinguishes swell and shrinkage of soils?

• A. Swell is volume decrease; shrinkage is volume increase.
• B. Swell is volume increase when soil is compacted; shrinkage is volume decrease when soil is loosened.
• C. Swell is volume increase when soil is excavated to a loose state; shrinkage is volume decrease when soil is compacted.
• D. Swell occurs only with organic soils.

Answer: (C)