Re: When the total weight of a shipment is increased, it is

When the total weight of a shipment is increased, it is either accompanied by an increase in freight charges, or a delay in delivery time, as shipping companies may choose a slower and cheaper mode of transportation.
(A) When the total weight of a shipment is increased, it is either accompanied by an increase in freight charges, or - WHEN can not be used to refer to metaphorical time. Moreover Either ...or Coordinate conjunction is not parallel. Incorrect
(B) When the total weight of a shipment is increased, it is accompanied either by an increase in freight charges or
- WHEN can not be used to refer to metaphorical time. Incorrect

(C) When the total weight of a shipment is increased, the increase is either accompanied by an increase in freight charges or by
- "Increase is what?" Its not clear which increase we are talking about. WHEN can not be used to refer to metaphorical time. Moreover Either ...or Coordinate conjunction is not parallel. Incorrect

(D) Any increase in the total weight of a shipment is accompanied by either an increase in freight charges, or by - Here structure is "By Either X or BY Y" and thus this is not parallel. Incorrect

(E) Any increase in the total weight of a shipment is accompanied either by an increase in freight charges or by - Correct use of Parallel structure "Either BY X or BY Y". Correct