Based on the given information:
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Posterior and
a. behind
have similar meanings.
In this context, the correct answer is:
a. behind
Explanation:
1. "Posterior" is a term used to refer to something located behind or at the rear of a structure or body part.
2. Similarly, "behind" means at the back or rear of something.
3. Therefore, in this case, "behind" is the word that closely matches the meaning of "posterior."
Remember, when trying to identify synonyms or words with similar meanings, it's essential to consider the context in which the words are used to ensure the most appropriate match.