long
Correct.

replacement

"Replacement" is divided "re/place/ment". The first syllable ends in a vowel. Since it is the only vowel, then the vowel is long according to rule #9:When a syllable ends in any vowel and is the only vowel, that vowel is usually long. Examples: "pa/per, me, I, o/pen, u/nit, and my".

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