Given a sentence with a missing word, pick the answer option that best fills out the missing word in the sentence. Indicate each answer with its index ('a', 'b', 'c', 'd').

[Q]: Pelicans use ____ different ways to feed.\Question: Choose the right answer from options given a) no b) nine c) one d) two
[A]: d

[Q]: Poodles have ____ legs.\Question: Choose the right answer from options given a) one b) four c) six d) nine
[A]: b

[Q]: Taxonomists recognize up to ____ species of burdock.\Question: Choose the right answer from options given a) three b) seven c) six d) eight
[A]:
d