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: Some olive trees live to be ____ thousand years old.\Question: Choose the right answer from options given a) ten b) zero c) two d) seven
Example Output: c

Example Input: Most women take about ____ weeks to stop bleeding and to heal inside.\Question: Choose the right answer from options given a) two b) no c) four d) zero
Example Output: c

Example Input: Plants are divided into ____ main phyla based on shared characteristics.\Question: Choose the right answer from options given a) three b) four c) eight d) two
Example Output:
b