The question was a little wrong factually. B did 'it' first. However it was still cracked by Anubhesh, Kaushik and Mit.
A - Charles Sweeney. He dropped 'FatMan' on the 'bockscar' named after his aircraft commander Fredrick Bock.
B- Paul Tibbets. He dropped 'Little Boy' on the 'Enola Gay' named after his mother.
C - Boeing B-29 Superfortress, the make of both the planes.
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