Question

which organization worked on the manhattan project and produced the atomic bomb? office of scientific research and development house un - american activities committee northern securities company

Explanation:

The Manhattan Project, which developed the atomic bomb, was overseen by the Office of Scientific Research and Development (OSRD) during World War II. The House Un - American Activities Committee was related to investigating alleged disloyalty, and the Northern Securities Company was a railroad trust, so they are not related to the atomic bomb project.

Answer:

A. Office of Scientific Research and Development