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]: Living cells have at least ____ parts.\Question: Choose the right answer from options given a) seven b) three c) zero d) four
[A]: b


[Q]: Electrolytic capacitors have a useful life of about ____ years.\Question: Choose the right answer from options given a) ten b) eight c) zero d) seven
[A]: a


[Q]: Rancidity can be of ____ types, hydrolytic and oxidative.\Question: Choose the right answer from options given a) two b) three c) four d) one
[A]:
a