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').
--------
Question: Ostriches have ____ stomachs.\Question: Choose the right answer from options given a) four b) nine c) eight d) three

Answer: d


Question: Calves remain hidden for much of the time, and are weaned by ____ months of age.\Question: Choose the right answer from options given a) six b) three c) eight d) one

Answer: b


Question: Medical drugs can only kill ____ or two parasites each.\Question: Choose the right answer from options given a) one b) five c) seven d) no

Answer:
a