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:
Female cats come into heat cycles every ____ to four weeks during certain times of the year.\Question: Choose the right answer from options given a) eight b) ten c) zero d) three

Ex Output:
d


Ex Input:
Most roots require from three to ____ weeks to dry sufficiently to be safe.\Question: Choose the right answer from options given a) seven b) five c) three d) six

Ex Output:
d


Ex Input:
Water lilies vary in cover from ____ to twenty-four square feet each.\Question: Choose the right answer from options given a) six b) four c) three d) seven

Ex Output:

b