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').

Input: Consider Input: All birds have ____ legs with four toes each.\Question: Choose the right answer from options given a) zero b) one c) three d) two

Output: d


Input: Consider Input: Sound waves travel through the air in a similar manner, but in all ____ dimensions.\Question: Choose the right answer from options given a) three b) five c) nine d) one

Output: a


Input: Consider Input: Every animal has ____ limbs.\Question: Choose the right answer from options given a) zero b) four c) ten d) no


Output: b