I believe it is B, because it's using 'like' to compare the Arkenstone to different things.
A simile compares things with the words 'like' or 'as'.
Actually, yes, this is true. Let's look at some examples with the word "all" to see if it agrees with verbs in singular or in plural:
All is lost
All is well
All is arranged already.
All of it is nice
This shows us that "all" agrees with verbs in singular form: the correct answer is a) True.
Since <em>contrast</em> in short means to compare,
A. would be the best answer, since it compares the qualities of a dog to a cat.
Hope I helped!
