Concept:The target phonetic symbol is the voiced sound /ð/, as in "this" or "smooth".
Explanation:"Thyme" is pronounced /taɪm/, with no /θ/ or /ð/ sound.
"Pith" is pronounced /pɪθ/, which has the voiceless /θ/ at the end.
"Thin" is pronounced /θɪn/, which has the voiceless /θ/ at the beginning.
"Smooth" is pronounced /smuːð/, containing the voiced /ð/ sound.
Therefore, the word that contains the voiced sound /ð/ is "smooth".
Answer:C. smooth