The answer would be B. boiled, ate
The rhyme scheme in the poem is
<span>A. ABAB CDCD
Crocodile (A) rhymes with the third line Nile (A). Second line Tail (B) rhymes iwth fourth line Scale (B). First line in the second stanza Grin (C) rhymes with third line In (C) and second line in the second stanza Claws (D) rhymes with the final line Jaws (D).</span>