An author's purpose does not always need to express bias, but in this case the author is "biased" in favor of consumers. This is revealed most clearly in the following sentences:
"Now, airlines want their own surcharges to be withheld from advertisements, and instead to present them only near the end of the purchasing process, where consumers may not have enough time to carefully consider prices.
If advertising rules change, fictional surcharges will surely emerge aimed at “lowering prices,” obscuring the actual cost of fares."
"In the end, consumers will lose the ability to make informed choices."
These statements show that the author is worried about consumers being victimized by "fictional surcharges" that will obscure the true price of fares and deprive them of "the ability to make informed choices." If the author were simply stating the facts behind a conflict (as choice E suggests), s/he would not express this concern for the well-being of consumers. Nowehere does the author suggest a similar concern for the airlines. In fact, s/he is essentially accusing the airlines of deception. Choice (A) accurately reflects the author's viewpoint that airlines should not be allowed to separate their own surcharges because that practice is unfair to consumers.