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: People can go without food for up to about ____ weeks.\Question: Choose the right answer from options given a) three b) one c) nine d) four

Answer: a


Question: Organisms have ____ forms of nucleic acid.\Question: Choose the right answer from options given a) four b) three c) two d) one

Answer: c


Question: Some children take their first steps at ____ months, others at fourteen months.\Question: Choose the right answer from options given a) two b) ten c) no d) nine

Answer:
b