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: Fawns weigh about ____ to nine pounds at birth.\Question: Choose the right answer from options given a) five b) ten c) nine d) six
Example Output: d

Example Input: Organisms have ____ forms of nucleic acid.\Question: Choose the right answer from options given a) four b) three c) two d) one
Example Output: c

Example Input: Credit reports describe an individual's credit history for the last seven to ____ years.\Question: Choose the right answer from options given a) ten b) six c) two d) no
Example Output:
a