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').

Water is present in all ____ phases in Earth s atmosphere.\Question: Choose the right answer from options given a) six b) nine c) two d) three
d

Respiratory therapists complete two to ____ years of education.\Question: Choose the right answer from options given a) no b) one c) four d) eight
c

Neurons are acutely sensitive to stress, possibly because they exhibit little or ____ stress response.\Question: Choose the right answer from options given a) seven b) no c) two d) eight

b