The correct answer is D.
A diary is a book in which you record your thoughts or feelings or what has happened each day.
Very similarly, a journal is a record of experiences kept regularly for private use.
While a diary is mostly used to reflect on feelings and thoughts, journals are mainly used to keep record of different experiences, for example, a journey.
They are both written in the first person, and both posses the writter's subjective point of view.