What was the code name for the secret united states project set up in 1942 to develop atomic bombs for use in world war ii?

Manhattan Project. The code name for the effort to develop atomic bombs (see also atomic bomb) for the United States during World War II. The first controlled nuclear reaction took place in Chicago in 1942, and by 1945, bombs had been manufactured that used this chain reaction to produce great explosive force.

mark other guy brainliest

i would think the answer is between b and d i would say d sorry if wrong