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: Woodchucks produce about ____ young and virtually all females breed annually.\Question: Choose the right answer from options given a) ten b) four c) no d) six
Example Output: b

Example Input: Tardigrades are microscopic, water-dwelling, segmented animals with ____ legs.\Question: Choose the right answer from options given a) eight b) nine c) one d) seven
Example Output: a

Example Input: Stoneflies have ____ pairs of wings.\Question: Choose the right answer from options given a) zero b) four c) eight d) two
Example Output:
d