Option E is a trap answer, the author of the question purposefully (to trap) trying to compare the previous year's sales with the year before the previous year. In the passage we are told that the Fastfood King has a planned %age of sale increase which they failed.

Let's think other way If in the year before the previous year the sale was 20% more we don't know about the sale figure of all other foods. Option A says that the sale of all other food decreases but still sales goes up by 10% so we can conclude that this 10% up in the sales is contributed only by the Fast Fries.

Answer is A