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').

Example Input: Most roots require from ____ to six weeks to dry sufficiently to be safe.\Question: Choose the right answer from options given a) two b) four c) eight d) three
Example Output: d

Example Input: Roundworms are fairly large worms that can grow to be ____ or five inches long.\Question: Choose the right answer from options given a) no b) nine c) four d) zero
Example Output: c

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