Approximately two hundred brands of personal computers are being manufactured, but we currently limit our inventory to only the eight most popular brands. We plan to increase greatly the number of computers we sell by expanding our inventory to include the ten best-selling brands.
Which of the following, if true, points out a major weakness of the plan above?

(A) The capabilities of three most popular personal computers add to be approximately equivalent, with no brand having consistent superiority in all respects.
the manufacture has top 8 so seems irrelevant especially we are talking about sales here.

(B) The seven most popular brands of personal computers account for almost all computers sold.
MAYBE. If this is the case then the company isn't expanding its inventory much at all since 7 of the "top 10" would be existing brands....

(C) As the users of personal computers become more sophisticated, they are more willing to buy less well-known brands of computers.
We dont know the figures though so it might be negligible

(D) Less popular brands of computers often provide less profit to the retailer because prices must be discounted to attract customers.
good info but doesnt say how much sales those generate.

(E) The leading brand of personal computer has been losing sales to less popular brands that offer similar capabilities for less money.
MAYBE - the manufacture is expanding to top 10 best selling so theoretically that COULD cover these "rising stars". Also we dont know how spread out or concentrated the losses are - if it is spread out among 100 brands then not a big deal. if it is to a couple then it is a big deal and the manufacture would cover it.
Pls Discuss reasons behind your answer.