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]: Ants have ____ stomachs.\Question: Choose the right answer from options given a) two b) nine c) four d) seven
[EX A]: a

[EX Q]: Ribosomes have two subunits, ____ slightly larger than the other.\Question: Choose the right answer from options given a) eight b) zero c) one d) two
[EX A]:
c