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]: 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]: Death occurs during the first ____ days of illness without intensive care.\Question: Choose the right answer from options given a) seven b) eight c) five d) nine
[EX A]: a

[EX Q]: Diarrhea refers to the passage of loose or watery stools ____ or more times a day.\Question: Choose the right answer from options given a) eight b) four c) three d) seven
[EX A]:
c