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:
Baboons can travel up to ____ miles a day.\Question: Choose the right answer from options given a) seven b) three c) two d) six

Ex Output:
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:
Blood pressure is measured by ____ numbers.\Question: Choose the right answer from options given a) zero b) eight c) two d) seven

Ex Output:

c