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: Sexual reproduction involves ____ parents, one male and one female.\Question: Choose the right answer from options given a) zero b) two c) nine d) four
Example Output: b

Example Input: Parapsychologists have ____ basic approaches to their subject matter.\Question: Choose the right answer from options given a) three b) two c) ten d) five
Example Output: b

Example Input: Crustaceans mostly live in water and have at least ____ legs.\Question: Choose the right answer from options given a) one b) ten c) six d) eight
Example Output:
b