Complete the sentence: You paid $25 for a simple breakfast?! They have certainly ____________ you!

The correct answer, "overcharged," fits the context of the sentence in a way that indicates the breakfast cost more than it should have. The prefix "over-" suggests an excess amount or an inflated price, highlighting that the speaker finds the $25 price for a simple breakfast to be unreasonable or unfair. This expression conveys the sentiment of being taken advantage of financially, which is the key point in this scenario.

The other options do not convey the intended meaning as effectively. "Charged" implies a standard transaction without any indication of excess or fairness. "Undercharged" suggests that the price was lower than expected, which contradicts the speaker's sentiment of disbelief at the high cost. "Recharged" refers to charging again, which is unrelated to the context of feeling that the price was unreasonably high. Thus, "overcharged" is the most appropriate choice for expressing the speaker's surprise at the high cost.