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: Elephants give birth to one calf every ____ to nine years on average.\Question: Choose the right answer from options given a) no b) four c) three d) seven

Answer: b


Question: Chimeras are ____ headed creatures that shoot fire from all three heads, damaging a wide area.\Question: Choose the right answer from options given a) three b) one c) eight d) six

Answer: a


Question: Cysts are small vesicles filled with a clear fluid and usually cause ____ complaints at all.\Question: Choose the right answer from options given a) five b) two c) no d) ten

Answer:
c