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]: China is reportedly in the top ____ nations in industrial output.\Question: Choose the right answer from options given a) seven b) ten c) three d) five
[EX A]: b

[EX Q]: Most birds have ____ toes, three that face forward and one rearward.\Question: Choose the right answer from options given a) two b) ten c) nine d) four
[EX A]: d

[EX Q]: Cardiovascular disease is the cause of more deaths than the next ____ causes of death combined.\Question: Choose the right answer from options given a) eight b) zero c) two d) seven
[EX A]:
d