Among the options given, the one with the prefix that means "under" or "below" is:
D. sub-
- A prefix is a group of letters that we add to the beginning of a word in order to create a new word.
- The Latin prefix sub- is used to indicate that something is under something else or lower than something else.
- Examples of words that use that prefix and its variations are: submarine, substandard, subterranean, surreal, etc.
- Breaking one of them down: subterranean refers to something that is under the ground, the earth.
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