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]: Centrifugal pumps can usually handle up to about ____ percent by volume of air.\Question: Choose the right answer from options given a) one b) five c) eight d) seven
[EX A]: b

[EX Q]: Most resistors have three coloured bands close together at one end and ____ single band at the other.\Question: Choose the right answer from options given a) two b) one c) ten d) five
[EX A]: b

[EX Q]: Most children start primary school at ____ years of age.\Question: Choose the right answer from options given a) five b) four c) ten d) eight
[EX A]:
a