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').

Scorpions can live for ____ to seven years.\Question: Choose the right answer from options given a) one b) six c) five d) three
d

Mothers typically have from one to ____ cubs, which are born blind and toothless.\Question: Choose the right answer from options given a) six b) zero c) four d) seven
a

Stroke is our nation's number ____ killer, and a leading cause of disability for older adults.\Question: Choose the right answer from options given a) zero b) six c) three d) no

c