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:
Black widows mature in ____ to four months.\Question: Choose the right answer from options given a) two b) seven c) eight d) zero

Ex Output:
a


Ex Input:
Collars come in ____ shapes.\Question: Choose the right answer from options given a) six b) two c) four d) zero

Ex Output:
b


Ex Input:
Computer printers use ____ methods for creating words and images on paper.\Question: Choose the right answer from options given a) four b) three c) five d) two

Ex Output:

b