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The phrase that should be included to improve the clarity of the sentence is:

A. meaning they touch the snow only in the middle of the board.

Explanation:

Someone who does not snowboard will probably find the original sentence to be a little difficult to understand. We do not know what a camber is. Thus, for the author of the sentence to improve its clarity, that is, to make the sentence understandable to anyone who reads it, he must explain what a camber is.

Among the options, the only one that does that is the first one. The other options only explain that a camber is a technology used in snowboarding, but we still do not know what it is or what it does. However, the first choice lets us know that an inverted camber means the board only touches the snow in its middle. Therefore, it improves clarity.

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.