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:
Some taxonomists classify only ____ species though.\Question: Choose the right answer from options given a) one b) six c) two d) three

Ex Output:
c


Ex Input:
Condors become sexually mature at about five or ____ years of age and mate for life.\Question: Choose the right answer from options given a) nine b) seven c) one d) six

Ex Output:
d


Ex Input:
Most countries use just two or ____ languages.\Question: Choose the right answer from options given a) ten b) two c) three d) six

Ex Output:

c