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]: Studies show that childhood obesity is epidemic and that ____ in five children is overweight.\Question: Choose the right answer from options given a) one b) two c) nine d) ten
[A]: a


[Q]: Reservoirs cover an area of the planet ____ times the size of Britain.\Question: Choose the right answer from options given a) two b) eight c) three d) six
[A]: d


[Q]: Crawlers are minute, orange-yellow and oval, with six legs and ____ pair of antennae.\Question: Choose the right answer from options given a) three b) eight c) four d) one
[A]:
d