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: Amelia Island is the only territory in American history to serve under ____ flags.\Question: Choose the right answer from options given a) eight b) no c) six d) five

SOLUTION: a

PROBLEM: All quetzals have ____ legs.\Question: Choose the right answer from options given a) four b) zero c) eight d) ten

SOLUTION: a

PROBLEM: Mood changes such as irritability, anger and depression usually settle within ____ or four weeks.\Question: Choose the right answer from options given a) six b) three c) one d) four

SOLUTION:
b