Which statement is a main idea of The Mary Celeste: An Unsolved Mystery from History?

As an "open file" – a mystery still waiting to be solved.

Explanation: In this story, we learn that the "Mary Celeste" is considered an "open file" by the father, as it is a mystery that is waiting to be solved. The Mary Celeste was a ship that was found 400 miles east of the Azores on December 5, 1872. It was found by the crew members of the British brig Dei Gratia. The Mary Celeste had left New York City eight days earlier and should have safely arrived in Genoa, Italy. However, the ship was discovered to be empty, with no sign of damage. No one knows what happened to the crew, which makes this a mystery still waiting to be solved.

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i believe the answer is:

-   william jennings bryan is a democrat while mckinley was a republican

at that time, the segment of population that choose for democratic party were the voters with low economic background and vice versa

- william jennings has support of populists and wants to have inflation to farmers while mckinley has support of bankers and businessmen , doesn't want inflation

the fixed value of gold make the large business able to stack up their gold without   being worried that it would devaluated.

- william jennings supported the silver standard while mckinley supported the gold standard

according to jenning, using other metal beside gold could the poor people to have more purchasing power and them advance in the society.