In the main, incidents of breakdowns in nuclear reactors have
not resulted from lapses of high technology but commonplace inadequacies in plumbing and wiring.
(A) not resulted from lapses of high technology but - parallelism issue - Not X, but Y - resulted from lapses of high technology is not parallel to commonplace inadequacies in plumbing and wiring
(B) resulted not from lapses of high technology but from - Correct
(C) resulted from lapses not of high technology but - parallelism issue - same as A - of high technology is not parallel to commonplace inadequacies in plumbing and wiring
(D) resulted from lapses not of high technology but have stemmed from - parallelism issue - same as A - - the second part will read as incidents of breakdowns in nuclear reactors have resulted from lapses have stemmed from
(E) resulted not from Lapses of high technology but have stemmed from - parallelism issue - same as A - the second part will read as incidents of breakdowns in nuclear reactors have resulted have stemmed from
Answer B
In the main, incidents of breakdowns in nuclear reactors have