What was the approximate total cost of the Manhattan Project (in today's dollars) that developed the first nuclear weapons during World War II?

The development of nuclear weapons during World War II represented one of history's most significant military product developments. The Manhattan Project combined cutting-edge science, unprecedented funding, and extreme secrecy. This poll tests your knowledge about the financial aspects of this revolutionary military technology development program that forever changed warfare and international relations.

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$2 billion ($23 billion in 2023 dollars)
$500 million ($5.7 billion in 2023 dollars)
$10 billion ($114 billion in 2023 dollars)
$100 million ($1.1 billion in 2023 dollars)