Choose the word with the correct prefix usage. Form a new word from the given base word by adding an appropriate prefix (use only one prefix and select the option that forms a meaningful and commonly accepted English antonym):
Base word: "REPLACEABLE"

In English grammar, adjectives starting with the letter 'r' frequently take the negative prefix "ir-" to construct their opposite or antonym forms (e.g., responsible $\to$ irresponsible, regular $\to$ irregular).
Applying this rule to the base word "replaceable" yields "irreplaceable", which means something that is impossible to replace if lost or damaged. The other options are incorrect and do not form standard English words.