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]: Elephants give birth to one calf every ____ to nine years on average.\Question: Choose the right answer from options given a) no b) four c) three d) seven
[A]: b


[Q]: Water is present in all ____ phases in Earth s atmosphere.\Question: Choose the right answer from options given a) six b) nine c) two d) three
[A]: d


[Q]: Some people have mild signs of illness or ____ symptoms at all.\Question: Choose the right answer from options given a) three b) no c) nine d) zero
[A]:
b