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:
Black bears stand ____ to six feet long and almost three feet at the shoulders when on all fours.\Question: Choose the right answer from options given a) three b) five c) four d) one

Ex Output:
b


Ex Input:
Most people require roughly seven to ____ hours of sleep a night to stay alert through the day.\Question: Choose the right answer from options given a) eight b) ten c) one d) five

Ex Output:
a


Ex Input:
Most musicians compose music within ____ or possibly two genres.\Question: Choose the right answer from options given a) eight b) two c) three d) one

Ex Output:

d