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]: Most children have a vocabulary of eight to ____ words, including names, by eighteen months of age.\Question: Choose the right answer from options given a) ten b) one c) seven d) eight
[EX A]: a

[EX Q]: Japan is the second largest single country importer with about ____ per cent of world oat imports.\Question: Choose the right answer from options given a) five b) one c) four d) eight
[EX A]: a

[EX Q]: Infertility affects ____ in five couples today.\Question: Choose the right answer from options given a) one b) ten c) seven d) three
[EX A]:
a