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: Corn borers complete at least ____ generations each summer.\Question: Choose the right answer from options given a) zero b) three c) two d) ten
Example Output: c

Example Input: Parliamentary democracy is less than ____ years old in Nigeria.\Question: Choose the right answer from options given a) eight b) two c) nine d) three
Example Output: b

Example Input: Life begins ____ months earlier at conception when an individual human being comes into existence.\Question: Choose the right answer from options given a) three b) seven c) two d) nine
Example Output:
d