TASK DEFINITION: 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').
PROBLEM: 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

SOLUTION: a

PROBLEM: Many animals use two or ____ forest structure types.\Question: Choose the right answer from options given a) eight b) zero c) two d) three

SOLUTION: d

PROBLEM: Mutations involving the rearrangement of the DNA nucleotides is caused in ____ distinct ways.\Question: Choose the right answer from options given a) five b) three c) two d) four

SOLUTION:
d