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]: Classes play ____ distinct roles in object-oriented programming.\Question: Choose the right answer from options given a) eight b) zero c) two d) no
[A]: c


[Q]: Women are ____ times as likely as men are to develop osteoporosis.\Question: Choose the right answer from options given a) zero b) four c) one d) nine
[A]: b


[Q]: Chickens have ____ legs and walk upright.\Question: Choose the right answer from options given a) one b) seven c) no d) two
[A]:
d