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').

[Q]: Human feet bear average five to ____ hundreds tons of weight everyday.\Question: Choose the right answer from options given a) six b) eight c) five d) nine
[A]: a


[Q]: Smoking is responsible for one out of ____ American deaths.\Question: Choose the right answer from options given a) five b) six c) nine d) seven
[A]: a


[Q]: Amniote skulls in lateral view showing the ____ main types of fenestration.\Question: Choose the right answer from options given a) no b) seven c) four d) zero
[A]:
c