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]: Material culture is the realm of ____ dimensional objects that make up our everyday environment.\Question: Choose the right answer from options given a) ten b) three c) six d) four
[A]: b


[Q]: Natural tellurium consists of ____ isotopes.\Question: Choose the right answer from options given a) six b) seven c) eight d) one
[A]: c


[Q]: Most gymnasts practice twice per day for at least ____ hours per session.\Question: Choose the right answer from options given a) five b) four c) three d) eight
[A]:
c