Respuesta :
Answer: C) Simile.
Explanation: A simile is a figure of speech that consists in making a comparison between elements that aren't obviously related, this comparison is made using the words "like" and "as." In the given passage, we can see a clear example of a simile (corresponding to option C) that compares Armando not talking to anyone to an oyster closing his shell, using the word "like" to make the comparison.