Many scientists are looking at alternative energy sources to replace fossil fuels. This can BEST be explained by which statement
A)
All alternative energy sources are better for the environment.
B)
Fossils fuels are much more expensive than alternative fuel sources.
Alternative energy sources are not renewable where fossil fuels are.
D)
Fossil fuels take millions of years to be renewed where alternative sources
do not.

You did not include option C, but the best option here is D.

normally working animals are domesticated and ruled by a master, a domesticator (tamer), to perform basic and important functions on a farm, for example. the value used in this context is animal labor in exchange for food. it is not so much a contrast to the story told by napoleon and the pigs, since the animals of that particular farm also performed functions on the farm through domestication. the only thing is that in this case, who rules them is a pig, also an animal, but very respected, to whom the other animals lent him submission. that's about a strong relationship of dependency between animal and owner.