Concept:Rhyming words are words that end with exactly the same vowel and consonant sound.
Explanation:The given word is "tern".
It is pronounced with the final sound "/ɜːn/".
A word that rhymes with it must end with this same sound.
Option A, "born", is pronounced "/bɔːn/".
Its vowel sound is different from the vowel sound in "tern".
Option B, "earn", is pronounced "/ɜːn/".
It has the exact same ending sound as "tern".
Option C, "fan", ends with the sound "/æn/".
This does not match the "/ɜːn/" ending.
Option D, "birth", ends with "/θ/", not "/n/".
So it cannot rhyme with "tern" either.
Therefore, the only word that rhymes with "tern" is "earn".
Answer:B. earn