Concept:Secondary succession happens in an area where soil already exists but the previous plant life has been removed or disturbed.Explanation:A sand dune, a bare rock, and a stretch of barren land do not have well-developed soil, so they would undergo primary succession.However, land that has just experienced a forest fire still contains soil along with surviving seeds and roots.Because the soil is already present, this land is suitable for secondary succession to begin again.Answer:C. a land that has just had forest fire