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: Bulbs bloom four to ____ weeks after planting.\Question: Choose the right answer from options given a) seven b) one c) six d) nine
Example Output: c

Example Input: All butterflies go through ____ distinct stages in their lives.\Question: Choose the right answer from options given a) eight b) seven c) four d) three
Example Output: c

Example Input: Most insects have three pairs of legs, ____ pair on each segment of the thorax.\Question: Choose the right answer from options given a) no b) one c) three d) seven
Example Output:
b