Answer:
A journal of someone who was present at the fall of the Berlin Wall will be the best primary source about the fall of the Berlin Wall.
Step-by-step explanation:
In order to write anything, the best way to get the information and details of any topic will be to first get a reliable primary source. This primary source can be anything, be it from an unspecified first hand experience of someone or an unofficial journal of a witness. The word "primary" suggests any source that is of the nearest and most trusted source of the event. So, in order to write about the fall of the Berlin Wall, it will be best to use the journal of someone who was present at the fall of the Berlin Wall. Newspaper editorials, articles from an online encyclopedia or even speeches of politicians may be infused with secondhand experiences or even be added with some words that will be of help to promote their own causes instead of highlighting the main issues. A personal journal of a person present at the time of the actual occurrence will have more validity with regards to the truth and real events, with no addition of any other falsehood.