The correct option is C Diary entry
Option A: A report is an informational work, a writing, speech or article. It is written for others to read and states events or news for the public's knowledge.
Option B: A headline is the text that tells the nature of the article that follows. Headlines are seen on news channels and in newspapers.
These are not suitable for a personal experience, like failing an exam.
Hence options A and B are incorrect.
Option D: 'Journal in a broad sense is a regular record of experiences and studies, in a systematic manner. Journals consist of focused topics. Journals can be of any type: academic journals, daily journals like magazines, public journals, and business journals. It is a report which consists of facts.'
Option C: A diary is a report in which we include all the things which we have done through the whole day. People mostly include all the tragic experiences which they might face in that day.
'Failing an exam' is a personal experience and would be more suitable for a diary, rather than a journal.
Journals are usually meant to record events, and diaries are a bit more personal, to share thoughts and feelings.
Hence option C is correct and D is incorrect.