Supporting details can do all of the enlisted options except introduce the main idea. Supporting details are there to support the main idea, so of course they cannot introduce it. They are the result of the main idea, not its creator.
Answer:
Moneylender
Explanation:
A synonym for usurer is "Moneylender", for the person <em>loans</em> money (lends) to others, with high percentage of net gain on return (interest).
In the story "The Devil and Tom Walker", Mr.Walker becomes a usurer, and charges high interest rate on others without a care to their financial position.
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A. using the dictionary is the only necessary step in the process of vocabulary building.
Spring would be the most inappropriate.
Spring is commonly used in literature to represent things like birth, new beginnings, growth, etc. Overall, Spring is used to show positive themes. To best represent a nearing death and other negative themes, an author should opt to use Winter or Autumn.