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: Elk retain their antlers for more than ____ months of the year.\Question: Choose the right answer from options given a) nine b) ten c) six d) seven

SOLUTION: c

PROBLEM: Natural chlorine contains ____ isotopes.\Question: Choose the right answer from options given a) two b) six c) eight d) seven

SOLUTION: a

PROBLEM: Electrons move ____ inches a nanosecond.\Question: Choose the right answer from options given a) nine b) ten c) eight d) four

SOLUTION:
a