Sentence Correction

IMO A

(A) one's own work, always one's own work: not thinking about it, not assessing it, but simply doing it
(B) always work; because you don't think about it or assess it, you just do it (not parallel to non-underlined part)
(C) always one's own work: not thinking about or assessing it, but simply to do it (not parallel)
(D) not to think or assess, but doing one's own work (not parallel)
(E) neither to think about one's own work nor to assess it, it is always simply doing it (no proper connector)