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: Ground squirrels breed once a year, averaging ____ to eight per litter.\Question: Choose the right answer from options given a) seven b) one c) six d) ten

SOLUTION: a

PROBLEM: Decompression illness is a continuum from ____ symptoms or signs to severe multisystem involvement.\Question: Choose the right answer from options given a) nine b) three c) no d) one

SOLUTION: c

PROBLEM: Females have ____ X chromosomes, one from each parent.\Question: Choose the right answer from options given a) ten b) two c) no d) four

SOLUTION:
b