C) money because the kingdom needed money
The question above is an excellent example of a word analogy. A word analogy is usually used to indicate the comparison of elements containing similarities in their definition. For the case above, it establishes the industry to its product thus the answer would be the third choice "cars."
One thing that everyone loves is either action, comedy, or romance. But people also like to talk about themselves. You can use any of these. Hope. This helps.