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:
Serial transfer is the sequential transmission of the ____ bit-voltages that constitute a byte.\Question: Choose the right answer from options given a) ten b) eight c) two d) four

Ex Output:
b


Ex Input:
Bacteria come in ____ basic shapes.\Question: Choose the right answer from options given a) five b) one c) three d) nine

Ex Output:
c


Ex Input:
Men are more likely than women to have been off cigarettes for ____ or more years.\Question: Choose the right answer from options given a) five b) ten c) seven d) three

Ex Output:

a