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The correct answer is Option A — USA and Trinity Test 1945. The United States conducted the world's first nuclear weapon test codenamed Trinity Test on July 16, 1945, at the Trinity site in the Jornada del Muerto desert of New Mexico. The device tested was a plutonium implosion bomb called the Gadget. The test was part of the Manhattan Project directed by J. Robert Oppenheimer. Just three weeks later atom bombs were dropped on Hiroshima and Nagasaki. Option B is incorrect: The Soviet Union conducted its first test called Joe-1 (RDS-1) on August 29, 1949. This made USSR the second nuclear state. It was in response to the USA nuclear monopoly. Option C is incorrect: The UK conducted its first test called Hurricane on October 3, 1952, at Monte Bello Islands Australia. This made UK the third nuclear state. Option D is incorrect: China conducted its first nuclear test called 596 (also called 059 by Chinese) on October 16, 1964, in the Lop Nur test site in Xinjiang. This made China the fifth nuclear state after USA USSR UK and France.
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