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').
--------
Question: Some olive trees live to be ____ thousand years old.\Question: Choose the right answer from options given a) ten b) zero c) two d) seven

Answer: c


Question: 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

Answer: a


Question: Smoking causes around one in ____ deaths from heart disease.\Question: Choose the right answer from options given a) one b) three c) nine d) five

Answer:
d