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: Peonies grow from two to ____ feet in height.\Question: Choose the right answer from options given a) five b) zero c) three d) four
Example Output: d

Example Input: People can go without food for up to about ____ weeks.\Question: Choose the right answer from options given a) three b) one c) nine d) four
Example Output: a

Example Input: Plants typically take ____ to three years to fully mature.\Question: Choose the right answer from options given a) two b) nine c) eight d) seven
Example Output:
a