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:
Calves can browse and follow their mother at three weeks old and are weaned at ____ months.\Question: Choose the right answer from options given a) five b) seven c) four d) three

Ex Output:
a


Ex Input:
Muskrats have long teeth, ____ upper and two lowers.\Question: Choose the right answer from options given a) one b) two c) four d) ten

Ex Output:

b