Respuesta :
Answer:
They realized they had intercepted a message from the German foreign secretary.
D on Ed2020
The code breakers were excited when they realized that 97556 stood for Zimmermann because the intercepted message was from the German foreign secretary.
What is a Code?
This is defined as a system of replacing the words in a message with other words or symbols, so that nobody understands it unless they know the system.
This was why the code breakers were excited as they were finally able to decipher the message which was from the German foreign secretary thereby making option D the most appropriate choice.
Read more about Codes here https://brainly.com/question/4514135