Which best describes the author’s viewpoint about the people who learned to decipher the enigma in the enigma machine?

The statement that best describes the author’s viewpoint about the people who learned to decipher the Enigma in The Enigma Machine is that (B)They played a very significant role in helping Allied forces. 

Here are the following choices:
A.They deserved more recognition for their service than they got. 
B.They played a very significant role in helping Allied forces. 
C.They should not have tricked the Germans by sending false codes. 
D.They were not as important as the soldiers on the battlefield.

Where is the visual?

Is there more to this?