English, 28.05.2020 06:02, mimi19374

Which statement best expresses the central idea of the excerpt?

James Jay was a spy for the Americans and had knowledge of chemistry.
James Jay’s invisible ink system allowed Washington to write secret messages.
James Jay believed secret messages that became visible because of heat were not secure.
James Jay’s system required two chemicals for writing and reading invisible ink messages.

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Which statement best expresses the central idea of the excerpt?

James Jay was a spy for...