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').

[EX Q]: Decompression illness is a continuum from ____ symptoms or signs to severe multisystem involvement.\Question: Choose the right answer from options given a) nine b) three c) no d) one
[EX A]: c

[EX Q]: Mechanical digestion occurs as ____ strong layers of muscle contract to produce a churning motion.\Question: Choose the right answer from options given a) four b) no c) three d) six
[EX A]: c

[EX Q]: T tetrahedron A volumetric connection element that connects ____ positions in a field.\Question: Choose the right answer from options given a) zero b) six c) four d) no
[EX A]:
c