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]: Batteries consist of ____ electrodes immersed in an electrolyte.\Question: Choose the right answer from options given a) two b) eight c) three d) seven
[A]: a


[Q]: Parliamentary democracy is less than ____ years old in Nigeria.\Question: Choose the right answer from options given a) eight b) two c) nine d) three
[A]: b


[Q]: Angiograms require staying in the hospital about ____ hours from start to finish.\Question: Choose the right answer from options given a) four b) zero c) seven d) nine
[A]:
c