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]: Sexual reproduction involves ____ individual organisms.\Question: Choose the right answer from options given a) six b) no c) two d) nine
[A]: c


[Q]: Spores have ____ combinations of sexes.\Question: Choose the right answer from options given a) four b) five c) seven d) three
[A]: a


[Q]: Dodecaphonic music is based on a series of ____ notes.\Question: Choose the right answer from options given a) six b) two c) five d) ten
[A]:
d