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]: Potassium helps maintain fluid regulation and normal pH. All ____ help normalize.\Question: Choose the right answer from options given a) three b) six c) two d) one
[EX A]: a

[EX Q]: Most aphthous ulcers heal in one to ____ weeks.\Question: Choose the right answer from options given a) two b) eight c) one d) seven
[EX A]: a

[EX Q]: Pups depend on their mother during the first six to ____ months of their life.\Question: Choose the right answer from options given a) six b) no c) ten d) eight
[EX A]:
d