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').

[Q]: Today there are ____ UK hospitals doing heart transplants.\Question: Choose the right answer from options given a) three b) five c) six d) nine
[A]: d


[Q]: Oar boats are smaller than motor boats and can accommodate four to ____ people.\Question: Choose the right answer from options given a) zero b) three c) five d) no
[A]: c


[Q]: Hydrocarbons have ____ ozone depletion potential, and very low global warming impact.\Question: Choose the right answer from options given a) one b) eight c) no d) zero
[A]:
d