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:
Honeybees have ____ jobs.\Question: Choose the right answer from options given a) ten b) one c) three d) two

Ex Output:
d


Ex Input:
Meteorologists rely mainly on ____ types of satellites.\Question: Choose the right answer from options given a) four b) two c) ten d) three

Ex Output:
b


Ex Input:
Pacific salmon leave their home stream, swim out to sea and return one to ____ years later to spawn.\Question: Choose the right answer from options given a) eight b) six c) zero d) nine

Ex Output:

b