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]: Stroke is the number ____ cause of death in the United States.\Question: Choose the right answer from options given a) ten b) nine c) one d) three
[EX A]: d

[EX Q]: Many soils have ____ major layers or horizons, top soil, subsoil and parent material.\Question: Choose the right answer from options given a) one b) two c) seven d) three
[EX A]: d

[EX Q]: Most Chinese words consist of ____ or more characters.\Question: Choose the right answer from options given a) ten b) four c) two d) eight
[EX A]:
c