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').

Ex Input:
Most females are sexually mature at about ____ to six years.\Question: Choose the right answer from options given a) eight b) nine c) five d) two

Ex Output:
c


Ex Input:
Sexual maturity is reached at about ____ years of age.\Question: Choose the right answer from options given a) five b) ten c) no d) two

Ex Output:
d


Ex Input:
Russian banks have ____ year history of embezzeling depositors money.\Question: Choose the right answer from options given a) ten b) four c) five d) zero

Ex Output:

a