In which sentence is the word with a prefix spelled incorrectly? His puppy has been acting unruly all day. The results of the study exceeded our hopes. Please discard the wrapper in the nearest trashcan. This antique is ireplaceable.

The sentence in which the word with a prefix is spelled incorrectly is:

D. This antique is ireplaceable.

Explanation:

The word "irreplaceable" should be spelled with two "r". It is composed of an assimilated form of the prefix "in-", which means "not, the opposite of" and the word "replaceable". The change in the prefix from in- to -ir might be due to cacophony-related reasons, ir- sounding better or being more easily pronounced than -in. Anyhow, the correct spelling doubles the "r", and that is why letter D is the sentence that contains a prefix spelled incorrectly.

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