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]: Government buildings fly flags of the ____ nations.\Question: Choose the right answer from options given a) ten b) no c) seven d) two
[EX A]: d

[EX Q]: Antibodies contain ____ pairs of protein chains.\Question: Choose the right answer from options given a) no b) two c) nine d) zero
[EX A]: b

[EX Q]: Breast cancer affects more than one in ____ women.\Question: Choose the right answer from options given a) four b) seven c) no d) eight
[EX A]:
d