Concept:The underlined letters "ng" in "sing" represent the consonant sound /ŋ/.Explanation:"sing" is pronounced /sing/.Here, "ng" gives the velar nasal sound /ŋ/, not the sound /g/.Check each option for this sound.A. "bog" is /bog/, so it has /g/ at the end.B. "nagged" is /nægd/, so it contains the sound /g/.C. "zonked" is /zongkt/, and it contains the sound /ŋ/ before /k/.D. "game" is /geim/, so it begins with /g/.Only "zonked" contains the same consonant sound /ŋ/.Answer:C. zonked