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]: 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]: Obesity is, in general, the result of personal choices and poses ____ risk of communication.\Question: Choose the right answer from options given a) four b) six c) zero d) seven
[EX A]: c

[EX Q]: Some prepositions even consist of ____ or more words.\Question: Choose the right answer from options given a) two b) no c) three d) six
[EX A]:
a