What is extremely tragic?
AThe use of atom bombs .
BDestruction of Hiroshima and Nagasaki in 1945 .
CUnchecked development of atom bombs .
DUse of atomic bombs against mankind .
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AThe use of atom bombs .
BDestruction of Hiroshima and Nagasaki in 1945 .
CUnchecked development of atom bombs .
DUse of atomic bombs against mankind .