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]: Diatoms look like ____ shells that fit together.\Question: Choose the right answer from options given a) zero b) one c) two d) seven
[A]: c


[Q]: Most bacteria have one or ____ circular chromosomes.\Question: Choose the right answer from options given a) ten b) eight c) six d) two
[A]: d


[Q]: Body waves are of ____ types, compressional and shear .\Question: Choose the right answer from options given a) seven b) four c) two d) eight
[A]:
c