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]: Angiosperms inhabit all ____ continents, as well as the oceans.\Question: Choose the right answer from options given a) five b) seven c) three d) zero
[A]: b


[Q]: All loci have ____ or two alleles.\Question: Choose the right answer from options given a) no b) six c) four d) one
[A]: d


[Q]: Most joints lock ____ building parts tightly together.\Question: Choose the right answer from options given a) nine b) five c) zero d) two
[A]:
d