Harvesting a forest intermittently for lumber, as well as periodically clearing out underbrush and dead trees, is know as a)pine tree farming b)forestry services c)forest cultivation d)progressive lumbering

c)forest cultivation

Explanation:

Forest farming, or forest cultivation is a process by which the good quality lumber is harvested from the forest. The trees are not removed directly from the roots instead thick girth of tree trunk and branches are left to grow again. It also involves the clearing of the bushes and dead trees which makes the space available for re-plantation of the desired tree species.  

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