Approximately two hundred brands of personal computers are being manuf

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Could you please explain why (B) is correct?

Understand :
- we limit our inventory ( available stock with the company at present) to 8 most popular brands
- We will expand our inventory to include "ten best selling brands"
- why?? INCREASE GREATLY the number of computers we sell
- Flaw

Think:
Typical GMAT pattern - OVERLAP of groups.... I want to increase the sale of computers from my store. I already have 8 most popular computers , and now i am going to expand my inventory to 10 best selling brands. why?? I want to increase my sale SUBSTANTIALLY. But what if i get to know that the most popular are themselves best selling?? that is most of my current most popular brands are actually the best selling then including the same brands once again MAY NOT increase my sale GREATLY
.Have I made sure that both are actually different?? that is there is a minimal overlap of both groups??
- In this answer choice we are only considering the most popular brands and comapring capabilities among them. HOW does this choice help us ecaluate the efficacy of my plan to increase sale by include BST selling brands??
.
- If 7 of most popular brands are also the most selling (best selling) then including 2 top selling brands may not increase my sale GREATLY. Sure it may increase but not greatly
-This does not talk about a weakness in my plan. also there is a reason why "best selling brands" is used. It means consumers actuallu but those specific brands in great numbers.
- "profit" is not our concern. we are concerned with SALE
-"The " that means one particular brand is loosing its market to someone else. But are we including that brand in our inventory?? WE DONT KNOW

They are currently selling 8 most popular brands and expect that by selling 10 best selling brands their sales figures will shoot up.
We need a weakener.
Option B says that almost all the sales are accounted for by the 7 most popular brands hence inclusion of 2 more brands may not really have a big impact.
Hence B is the answer

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The plan here is to increase the number of computers in the inventory greatly by including 2 more brands. Choice B would be the most weakening sentence because if top 7 brands account for almost all the computers sold then it would make minimal change in the number of computers in the inventory if he includes two more brands. Hence, B is the answer.

I think here one of the major factor is that the question talks about best selling brands and not cheap/popular brand. A cheap brand can be best-selling. For example Oppo is a cheap brand in India but it is highly possible that it is one of the best selling brand

Premise: Approx 200 brands of PCs are being manufactured.
Premise: We currently limit our inventory to the eight most popular brands.
Conclusion: We plan to greatly increase the number of computers we sell by expanding our inventory to include the ten best-selling brands.

We’re looking to weaken the argument.

A. Irrelevant. These brands are included in either inventory offering.
B. This weakens the argument. If the seven most popular brands account for a majority of sales, then it seems unlikely that adding the ninth and tenth most popular brands would greatly increase the number of computers sold.
C. This potentially strengthens our argument, if by less well-known they mean a preference for the ninth and tenth best-selling brands. It’s not the answer to our question though.
D. Irrelevant. We’re talking about numbers of computers sold, not profit.
E. The leading brand could be losing sales to the second or third leading brand, or it could be losing sales to the ninth or tenth leading brand. Without that being clarified, this choice has an ambiguous effect on the conclusion.
Best choice is B.

QS: Weakness of the plan
Argument:
Bgrnd info: 200 brands but we have the 8 most popular ones!
Plan: if the 10 most popular, then we sell more comp.s.
The added 2 increases sales?!
(A) The capabilities of three most popular personal computers add to be approximately equivalent, with no brand having consistent superiority in all respects.--- OUT. It just describes the top 3.

(B) The seven most popular brands of personal computers account for almost all computers sold.-- Ok. a weakener for the plan

(C) As the users of personal computers become more sophisticated, they are more willing to buy less well-known brands of computers.- hurts the argument

(D) Less popular brands of computers often provide less profit to the retailer because prices must be discounted to attract customers.-- additional info. OUT

(E) The leading brand of personal computer has been losing sales to less popular brands that offer similar capabilities for less money.--hurts the argument

Author's Conclusion- Increase the number of computers we sell by expanding our inventory to include the ten best-selling brands

A. Out of scope- The capabilities of the top three most popular computers are not of our concern, we just need to find an option which will weaken our plan leading to less sales of computers

B. Correct Answer (Weakener)- If the seven most popular brands account for the most number of computers sold, then it doesn't make sense to add the best-selling brands, on adding the best-selling brands, it will only lead to a decrease in the overall number of computers that we sell. Suppose earlier we had 80 computers to sell from the most popular brands and we sold 79 of them, if we add 100 from the best-selling brands, we will sell only 79 computers of the total 180 as compared to 79/180 previously.

C. Neutral - If people are willing to buy less known brands, some of these brands might be a part of the ten best-selling brands right? So this might or might not lead to an increase in the number of computers that we sell.

D. Out of scope- We are not concerned with whether the profit of the retailer will increase or decrease or how his revenue will be affected!

E. Neutral- If the leading (most popular) brand of computers has been losing sales to less popular brands, again some of these brands might be a part of the best-selling brands that we plan to include, uncertain whether it will increase or decrease our sales.