Suppose a particular community is concerned about a fox population that kills and eats chickens on the local farms. what is the best course of action by this community? a) kill the foxes. b) trap and transport the foxes out of the region. c) introduce rabbits as an alternative source of food for the foxes. d) build enclosures for the chickens that the foxes cannot access.

I would say D.
Killing is never the answer, so not A.
Trapping and transporting them may seem good, but it would only mess up the environment that they left from because they have been there for so long, the environment must somehow rely on them, so not B.
Not C either because you only encourage the foxes to eat more animals on your land.
Therefore, D works best for this question.

The best course of action by the community is : D. Build enclosures for the chicken that the foxes cannot access

With this, the fox will eventually starved and forced to find another source of food outside that community

hope this helps