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:
Obesity is, in general, the result of personal choices and poses ____ risk of communication.\Question: Choose the right answer from options given a) four b) six c) zero d) seven

Ex Output:
c


Ex Input:
Metabolism have ____ stages-catabolism and anabolism.\Question: Choose the right answer from options given a) nine b) two c) five d) three

Ex Output:
b


Ex Input:
Right whales are slow swimmers, averaging just ____ miles per hour.\Question: Choose the right answer from options given a) nine b) six c) two d) five

Ex Output:

b