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:
Right whales are slow swimmers, averaging just ____ miles per hour.\Question: Choose the right answer from options given a) nine b) six c) two d) five

Ex Output:
b


Ex Input:
Digital bandwidth enables signal to be condensed as a five to ____ ratio.\Question: Choose the right answer from options given a) one b) nine c) seven d) six

Ex Output:
a


Ex Input:
Some eggs can hatch in just two or ____ days.\Question: Choose the right answer from options given a) eight b) two c) three d) four

Ex Output:

c