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]: Conglomerate integration is when ____ apparently unconnected companies merge.\Question: Choose the right answer from options given a) two b) six c) no d) three
[A]: a


[Q]: Water weighs about ____ pounds per gallon.\Question: Choose the right answer from options given a) seven b) ten c) zero d) nine
[A]: b


[Q]: Weasels reaching five to ____ years are regarded as fully mature.\Question: Choose the right answer from options given a) three b) one c) nine d) six
[A]:
d