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 programming languages have ____ or more standards.\Question: Choose the right answer from options given a) no b) seven c) two d) three

Ex Output:
c


Ex Input:
Ammonia is among the ____ most abundantly produced chemicals in the world.\Question: Choose the right answer from options given a) five b) zero c) no d) eight

Ex Output:
a


Ex Input:
Nymphs emerge within five to ____ days.\Question: Choose the right answer from options given a) seven b) four c) three d) one

Ex Output:

a