When are conservation efforts most effective?
a.
conservation efforts are most effective when multiple groups cooperate.
b.
conservation efforts are most effective when government is solely responsible for them.
c.
conservation efforts are most effective with individual efforts.
d.
conservation efforts are always effective.

c.  Conservation efforts are most effective with individual efforts.  

Conservation efforts are those efforts which are performed in order to retain, preserve and conserve the renewable and non- renewable resources available in the environment in which the human population is living so that these resources can meet the needs of the present as well as future generation. The conservation although is a team or group effort to create awareness of the judicious use of the resources. But it can be effective if it is followed and performed at the individual level.  

For example, the judicious use of water and fossil fuels like coal and petroleum can be controlled and regulated at the individual level. If a single individual is using these resources in large amount than this could hamper the needs of the other individuals and limit the changes of availability of resources of the future generation.

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in addition to spreading humanist ideas, erasmus has contributed to criticism of corruption in the church.