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]: 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
[EX A]: a

[EX Q]: Serial transfer is the sequential transmission of the ____ bit-voltages that constitute a byte.\Question: Choose the right answer from options given a) ten b) eight c) two d) four
[EX A]: b

[EX Q]: Some apartment complexes are as small as ____ units while others have hundreds of individual units.\Question: Choose the right answer from options given a) four b) zero c) one d) six
[EX A]:
a