Parmi ces options, /k/ est prononcé dans :

The question asks in which word the letter c produces the /k/ sound. In French, the pronunciation of c follows a clear rule:

• c is pronounced /k/ before a, o, u, and before consonants.
• c is pronounced /s/ before e, i, and y.

Applying this rule to each option:

• coup - c is followed by o, so it is pronounced /k/: /ku/. This is the correct answer.
• chef - the combination ch is pronounced /ʃ/ (like English "sh"), not /k/.
• ceux - c is followed by e, so it is pronounced /s/: /sø/.
• ciel - c is followed by i, so it is pronounced /s/: /sjɛl/.

The word coup (a blow or strike) is the only option where c produces the /k/ sound.