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: Pandas reach adulthood at about ____ years of age.\Question: Choose the right answer from options given a) eight b) seven c) five d) six
Example Output: c

Example Input: Cattle are the second most important commodity in ____ states and third in six states.\Question: Choose the right answer from options given a) nine b) five c) no d) eight
Example Output: a

Example Input: Many scientists consider ____ subspecies of brown bear.\Question: Choose the right answer from options given a) eight b) seven c) zero d) two
Example Output:
d