Answer: A: Malapropism (also known as dogberryism).
Explanation: The sentence is derived from Shakespeares Twelfth Night. When the sentenced it used, Sir Andrew misuses the word "accost", and is corrected, but doesn't understand what the word means afterward. Malapropism (if you didn't know) is the substitution of one word for another incorrect word with a similar sound, usually to comic effect.
Explanation: None of the other choices apply except as for a pun. A pun is a joke exploiting the different possible meanings of a word or the fact that there are words which sound alike but have different meanings.