One of the objectives that export tariffs are imposed for is to c) reduce exports from a sector.
A government's first and foremost purpose is to protect its citizens and this includes ensuring that resources are available to do so.
If a resource is in short supply in a country and there is a need to protect its supply, the government would impose export tariffs to reduce the export of that good for the benefit of the local market.
In conclusion, option C is correct.
Find out more on tariffs at https://brainly.com/question/6869228.