Answer:
(Correct) To document what happened during two days in his life
Explanation: I used the answers someone put it at to express how much he enjoys treasure hunting. That is not the right answer.
What is the author’s purpose in writing "Nicholas’s Diary: April 2 and 3"?
to express how much he enjoys treasure hunting
to show his disappointment in not finding treasure
to describe things that he and his father enjoy together
to document what happened during two days in his life