How prepared were the Allies for the German attack against their lines in the Ardennes (known as the Battle of the Bulge)?

They were not well prepared, which can be best seen from the fact that the Allies were surprised by the German attack on December 16th, 1944.

Explanation:

As the Allied forces were progressing well after D-Day they didn't expect large counter offensive of German troops. Still, Germans wanted to make last great effort and to divide Allied troops. At the beginning they managed to surprise Allied troops, but as the time passed Allies prevailed and defeated Germans.

what the first or next guy says

c) troops march forward in close formation against newer, more accurate weapons