Wind energy is plentiful in regions with vast, open spaces. it is a non-polluting, renewable resource. what could be an economic factor that makes the use of this resource less feasible than non-renewable resources, even in such regions? a) wind farms cannot be used to generate electricity. b) wind farms cannot operate at night due to the lack of winds. c) wind farms run on electricity, which is an expensive commodity. d) wind farms occupy a lot of land, which is an expensive commodity.

D. wind farms occupy a lot of land which is an expencive commodity

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The investiture controversy began as a power struggle between pope gregory vii (1072–85) and henry iv, holy roman emperor (1056–1106).[2] a brief but significant struggle over investiture also occurred between henry i of england and pope paschal ii in the years 1103 to 1107, and the issue played a minor role in the struggles between church and state in france, as well.by undercutting the imperial power established by the salian emperors, the controversy led to nearly 50 years of civil war in germany, and the triumph of the great dukes and abbots. imperial power was finally re-established under the hohenstaufen dynasty. historian norman cantor:

The answer is c epicenter