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:
Toucanets encompass ____ genera.\Question: Choose the right answer from options given a) seven b) six c) two d) one

Ex Output:
c


Ex Input:
Pelicans use ____ different ways to feed.\Question: Choose the right answer from options given a) no b) nine c) one d) two

Ex Output:
d


Ex Input:
Wind erosion is a threat to soils in all ____ cropping systems and in pastures.\Question: Choose the right answer from options given a) four b) ten c) nine d) seven

Ex Output:

a