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').

Example Input: Poodles have ____ legs.\Question: Choose the right answer from options given a) one b) four c) six d) nine
Example Output: b

Example Input: Studies show that childhood obesity is epidemic and that ____ in five children is overweight.\Question: Choose the right answer from options given a) one b) two c) nine d) ten
Example Output: a

Example Input: Bull sharks are a 'requiem' species, reaching up to ____ feet in length.\Question: Choose the right answer from options given a) one b) eight c) ten d) four
Example Output:
c