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:
Most birds have ____ toes, three that face forward and one rearward.\Question: Choose the right answer from options given a) two b) ten c) nine d) four

Ex Output:
d


Ex Input:
Plants have three and ____ way branching carying sixteen buds.\Question: Choose the right answer from options given a) seven b) six c) four d) ten

Ex Output:
c


Ex Input:
Pups stay with their mothers for ____ months, on average.\Question: Choose the right answer from options given a) four b) zero c) six d) nine

Ex Output:

c