Which Order of Timber Harvesting Methods Goes from Least Conservation

Which order of timber harvesting methods goes from least conservation of biodiversity to most conservation of biodiversity?

A) clear-cutting,selective harvesting,strip harvesting
B) strip harvesting,shelterwood harvesting,clear-cutting
C) selective harvesting,strip harvesting,shelterwood harvesting
D) clear-cutting,strip harvesting,shelterwood harvesting
E) All harvesting methods increase biodiversity equally.