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:
Many tractors have ____ wheel drive to get extra grip on the hills and in wet conditions.\Question: Choose the right answer from options given a) four b) seven c) five d) two

Ex Output:
a


Ex Input:
Blankets can take up to ____ days to dry in the colder months.\Question: Choose the right answer from options given a) eight b) three c) two d) nine

Ex Output:
b


Ex Input:
Wolves can go at a steady trot for ____ hours.\Question: Choose the right answer from options given a) eight b) zero c) no d) nine

Ex Output:

a