Final answer:
In the word "hunk," the nasal phoneme you hear is the voiceless velar nasal /ŋ/, not /m/, /n/, or /ɳ/.
Step-by-step explanation:
The nasal phoneme you hear in the word "hunk" is the voiceless velar nasal /ŋ/. This is the same sound you hear at the end of words like "sing" or "ring".
It is not the sound /m/, which is heard in words like "ham", nor is it the sound /n/, which is heard in words like "hand". Lastly, it is not the sound /ɳ/, which is a retroflex nasal not typically used in English pronunciation.