Concept:The underlined cluster "gn" in "sign" is tricky because the "g" is silent.
So the actual consonant sound represented by "gn" is simply /n/.
Explanation:The word "sign" is pronounced /saɪn/.
Only the /n/ sound is heard at the end, while the "g" remains silent.
Now compare the options.
"fawn" is pronounced /fɔːn/, and it also ends with the same /n/ sound.
So "fawn" matches the consonant sound in "sign".
"thing" ends with /ŋ/, not /n/.
"hymn" is pronounced /hɪm/, because its final "n" is silent.
"single" contains /ŋ/ or /ŋg/, but not the /n/ sound.
Therefore, the correct option is "fawn".
Answer:A. fawn