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:
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:
Most people recover in one to ____ months.\Question: Choose the right answer from options given a) no b) three c) seven d) eight

Ex Output:
b


Ex Input:
Most marginal plants can live in ____ to six inches of water.\Question: Choose the right answer from options given a) zero b) nine c) six d) seven

Ex Output:

a