What is the name of the World War II bomb that was detonated underwater in Poland?

What is the name of the World War II bomb that was detonated underwater in Poland?

A. Fat Man
B. Little Boy
C. Tall Boy
D. Small Man

Polish Navy divers tried to remotely neutralize a six-ton “Tallboy”. A British World War II bomb exploded during an effort to make it safe underwater by navy demolition specialists in northwestern Poland.