most strongly supports the argument against claim?

In January of last year, Fastfood King started using a new lowfat oil to cook its Fast Fries, instead of the less healthful corn oil that it had been using. Now Fastfood King is planning to switch back, saying that the change has hurt sales of Fast Fries. However, this claim is incorrect, since according to Fastfood King’s own sales figures, Fastfood King sold 10 percent more Fast Fries last year than in the previous year.

Which of the following, if true, most strongly supports the argument against Fastfood King's claim?

A)Total sales of all foods at Fastfood King’s locations increased by less than 10 percent last year.

B)Fastfood King enjoys higher profit margins on its Soft Drinks than it does on Fast Fries.

C)Fastfood King’s customers prefer the taste of Fast Fries cooked in corn oil to Fast Fries cooked in lowfat oil.

D)The number of customers that visited Fastfood King locations was more than 20 percent higher last year than the year before.

E)The year before last, Fastfood King experienced a 20 percent increase in Fast Fries sales over the previous year.

This argument links a STATISTIC to a conclusion.
When an argument offers a statistic as evidence, the assumption is generally the same: that there is ONLY ONE WAY to interpret the statistic.

Statistic: Fastfood King sold 10 PERCENT MORE FAST FRIES last year than in the previous year.
Conclusion: The change to low-fat oil DID NOT HURT SALES of Fast Fries last year.

A 10% increase could be good or bad; it depends on the CONTEXT.
If sales of every other type of food TRIPLED, then a 10% increase in the sales of the fries would be RELATIVELY small.
To support the conclusion here, the correct answer must show that the 10% increase was a good outcome and that sales of the fries were not hurt.

Answer choice A gives us what we need: Total sales of all foods at Fastfood King’s locations increased by less than 10 percent last year.
If overall food sales increased by LESS THAN 10%, then the 10% increase in the sales of the fries was RELATIVELY high, supporting the conclusion that sales of the fries were not hurt.

The correct answer is A.

Reasons to eliminate:

B) Profits are outside the scope; the conclusion is only about SALES.

C) If customers prefer corn oil, then the conclusion that switching to low fat oil did not hurt sales is WEAKENED.

D) If the number of customers increased by a higher percentage than did the amount of sales, then the conclusion that sales have not been hurt is WEAKENED.

E) If sales increased by smaller percentage last year than they had the previous year, then the conclusion that sales have not been hurt is WEAKENED.

Thanks GMATGuruNY
YOur reply is certainly helpful !