They had to remember over 500 letters and English phrases for example
FLAMETHROWER meant TANK
The
Berlin Wall
was constructed to nip in the bud any attempts by refugees to leave East
Berlin. Multitudes of East Germans envisaged fleeing from East Germany to the
Democratic West Germany through Berlin.To
avert this manifestly undesirable practice, the Communist East German
government erected the Berlin wall.
I think it is D but I could be wrong