Which of the Following Is an Example of the Word-Superiority

Which of the following is an example of the word-superiority effect?

A) People who live in Alaska know more words pertaining to snow than most people in Florida know.
B) People who start by learning the names of all the parts of an automobile engine eventually become superior auto mechanics.
C) People with a large vocabulary generally do better in school than people with a more limited vocabulary do.
D) People can identify the word WEST more easily than they can identify the letter W, after seeing both for just a split second.