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').

[EX Q]: Birds have ____ eyes.\Question: Choose the right answer from options given a) eight b) five c) nine d) two
[EX A]: d

[EX Q]: 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
[EX A]: c

[EX Q]: Friendship means to trust ____ or more people.\Question: Choose the right answer from options given a) eight b) three c) no d) two
[EX A]:
d