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: Military service is fulfilled by voluntary enlistment, generally for a period of ____ years.\Question: Choose the right answer from options given a) four b) one c) nine d) two

SOLUTION: c

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

SOLUTION: a

PROBLEM: Nests Have at least ____ nest for every three to four hens.\Question: Choose the right answer from options given a) zero b) five c) one d) seven

SOLUTION:
c