Here's why:
* Spelling: The "o" in "rose" is followed by a silent "e". This is a common pattern in English that usually indicates a long vowel sound.
* Pronunciation: The sound of "o" in "rose" is a long, drawn-out sound, similar to the "o" in "go" or "home".
* Contrast: Compare it to words like "rot" or "hot", where the "o" has a short, clipped sound.
So, the vowel sound in "rose" is definitely a long one!