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]: Kabbalists group the simple letters into ____ triplets.\Question: Choose the right answer from options given a) four b) no c) ten d) three
[EX A]: a

[EX Q]: Mosquitoes have three body parts and ____ legs.\Question: Choose the right answer from options given a) two b) nine c) six d) eight
[EX A]: c

[EX Q]: Tobacco kills four million people a year, ____ death every eight seconds.\Question: Choose the right answer from options given a) zero b) six c) one d) eight
[EX A]:
c