quel est le groupement correct du mot "professeur" ?

The question asks for the correct syllable grouping (groupement) of the word professeur. In French syllabification, each syllable contains exactly one vowel sound, and a single consonant between two vowels belongs to the following syllable.

The word professeur divides into three syllables: Pro/fes/seur.

• Pro - the consonant cluster pr stays together (as an onset), followed by the vowel o.
• fes - the consonant f begins the syllable, with the vowel e; the first s of the double ss closes this syllable.
• seur - the second s begins the final syllable, with the diphthong eu as its vowel and r as the closing consonant.

The other options are incorrect: Prof/esseur incorrectly splits the f from esseur, placing two vowel sounds in the second group; Pro/fesseu drops the final r; and prof/ssseu contains a misspelling and also drops the final r.