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: Psychiatrists say that one in ____ people are mentally ill.\Question: Choose the right answer from options given a) one b) two c) four d) nine

Answer: c


Question: Granite occurs in ____ separate masses.\Question: Choose the right answer from options given a) two b) eight c) nine d) no

Answer: a


Question: Global peace means ____ wars and global prosperity means good and cheap products keep flowing in.\Question: Choose the right answer from options given a) no b) zero c) four d) six

Answer:
a