Concept:Rhyming words have the same final vowel and consonant sound.
Explanation:The given word is
firm.
Its ending sound is /ɜːm/.
Now compare the ending sound of each option.
Option A:
born ends with /ɔːn/, so it does not rhyme.
Option B:
worm ends with /wɜːm/; the final part is /ɜːm/, exactly like
firm.
Option C:
burn ends with /ɜːn/, which is different.
Option D:
girl ends with /ɜːl/, which is different.
Only
worm matches the ending sound of
firm.
Answer:B. worm