Answer:
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.
