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').

All birds have ____ legs with four toes each.\Question: Choose the right answer from options given a) zero b) one c) three d) two
d

Sexual reproduction involves ____ individual organisms.\Question: Choose the right answer from options given a) six b) no c) two d) nine
c

Some people have ____ or four careers during their lives.\Question: Choose the right answer from options given a) three b) ten c) four d) one

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
a

