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:
Some species can make dives over ____ hundred feet deep.\Question: Choose the right answer from options given a) six b) eight c) two d) one

Ex Output:
b


Ex Input:
Mosquitoes spend one to ____ days in the pupae stage.\Question: Choose the right answer from options given a) zero b) two c) five d) three

Ex Output:
b


Ex Input:
Whole grains contain all ____ parts of the grain - the bran, endosperm, and germ.\Question: Choose the right answer from options given a) seven b) one c) four d) three

Ex Output:

d