Which of the followings events do historians credit as having started the atomic age? a. the first sustained and controlled nuclear chain reaction by enrico fermi in 1942 b. the first successful test of an atomic bomb in los alamos, new mexico c. the dropping if atomic bombs on 2 japanese cities at the end of ww|| d. the beginning of the nuclear arms race between the united states and the soviet union e. the application of nuclear technology to develop electricity for everyday use