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.