Which of the following is a good example of a tradeoff?

a)The government pleases oil companies by allowing them to drill on lands set aside for conservation but allows environmental activist groups to protest the drilling operations.
b)Groups that represent a variety of conflicting interests are all allowed to protest outside Congress and the White House.
c)The government pleases environmental activists by preserving public lands but also pleases ranchers by allowing them to rent public lands for grazing purposes.
d)The government pleases environmental activists by reintroducing wolves to Yellowstone National Park but angers ranchers by placing their cattle in danger.