Question

Why was Hall concerned that the Germans would learn about the British reading their secret messages?

Answer 1

C) The Germans would then find a different way of transmitting their messages.

Step-by-step explanation:

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Answer 2

Hall was concerned that the Germans would learn about the British reading their secret messages because if they announce in public what they have learned, then the Germans would automatically know that they opened the mails of the people. If done so, then the public would give a negative reaction to the government's way of "protecting" them.