In producing the /f/ sound , the passive articulator is:AThe lower lipBThe soft palateCThe upper teethDThe hard palateAnswer: C. The upper teeth Read Explanation: Production of the /f/ Sound:The sound /f/ is a voiceless labiodental fricative.It is produced by:Bringing the lower lip (active articulator)Into contact with the upper teeth (passive articulator)And forcing air through the narrow gap, creating friction. Read more in App