It take over 600 years for primary forest succession to reach the climax, or old-growth, forest. i.e,option D
Succession on land that did not previously have plants, such as soil exposed as a glacier retreats or a new sand bar in a river is called primary succession.
It takes over 600 years to primary forest succession to reach the climax. it includes breakdown of the rocks into soil and plants help in survival of different animal and progress from primary succession to the climax community.
Hence, option 'D' is correct.
Learn more about primary succession here:
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