Respuesta :
The answer to the question above would be that the sentence that uses the word "introspection" correctly would be the following one: After some soul-searching and introspection, Peter knew that it was time for him to move on. That is, the correct option would be D.
According to the Cambridge dictionary, "introspection" means "examination of and attention to your own ideas, thoughts and feelings". The example talks about soul-searching and getting to know oneself, that's why D is the correct answer.