Plural of 'mouse'.

**The reasoning** "Mouse" is an **irregular plural noun** in English. Unlike regular nouns where you just add "-s" or "-es" (like *book → books*), some words change their internal vowel sound when becoming plural. This pattern comes from Old English. The rule: **mouse → mice** (the vowel changes from "ou" to "i") This is similar to other irregular plurals like: - foot → feet - tooth → teeth - goose → geese **Why the wrong options tempt you** **A) mouses** — You're applying the regular plural rule (+s), which works for *most* English nouns but not this one. **C) meeses** — This seems to follow the "goose → geese" pattern, but then wrongly adds an extra "-s". Double mistake! **D) mouse** — Some words stay the same in plural (like *sheep*), but mouse isn't one of them. **Quick takeaway** When you see *mouse*, think of *tooth* — both change their middle vowel to "ee" sound for plural: **mice** and **teeth**, never add "-s" to irregular plurals.