Which symbol was prominently featured in the official logo of the Manhattan Project, the secret U.S. program that developed the first nuclear weapons during WWII?

During World War II, even highly classified military projects developed their own visual identities. The Manhattan Project, which developed the first nuclear weapons, had a distinctive logo that symbolized its mission while maintaining secrecy. This emblem appeared on documents, facilities, and equipment associated with the project. Test your knowledge of this significant piece of military branding history that represented one of the most consequential scientific undertakings of the 20th century.

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An eagle clutching lightning bolts
A stylized atom with electron orbits
A shield with crossed swords
A mushroom cloud silhouette