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:
Beavers live in families that include an adult pair and ____ to three years worth of offspring.\Question: Choose the right answer from options given a) no b) one c) four d) ten

Ex Output:
b


Ex Input:
Cleavage occurs typically in either one, two, three, four, or ____ directions.\Question: Choose the right answer from options given a) six b) three c) ten d) two

Ex Output:
a


Ex Input:
Some astronauts stay in space, ____ months or more, testing equipment and solitude.\Question: Choose the right answer from options given a) zero b) four c) six d) nine

Ex Output:

c