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:
Takins can even balance on their hind hooves to nibble on vegetation ____ feet above ground.\Question: Choose the right answer from options given a) two b) no c) nine d) eight

Ex Output:
d

Ex Input:
Foresters usually work ____ hours a day, five days a week.\Question: Choose the right answer from options given a) six b) five c) seven d) eight

Ex Output:
d

Ex Input:
Cancer affects ____ in three individuals.\Question: Choose the right answer from options given a) four b) one c) no d) seven

Ex Output:
b