Neither..nor VS Not...or???

A study of children of divorced parents found that 10 years after the parents' divorce, children who had been under six years of age at the time of the settlement were not preoccupied, nor even very curious, about the reasons that led to their parents' divorce.
(a)
(b) Not preoccupied with, or even very curious about, the reasons for their parents' divorce
(c)Neither preoccupied, nor even curious, with the reasons that led to their parents divorce
(d)Neither preoccupied with the reasons that led to their parents' divorces or even very curious about them
(e) Neither preoccupied with the reasons that their parents divorced nor even curious about it

The answer is (b); if it wasn;t for the "with" in (c), wouldn't it be correct as well- "neither...nor"?
when do you use "not...or" and "neither...nor"?

(i'm not 100% about the source- i saw it on the internet somewhere but it stated that the question was a prep question..sorry!)