【单选题】
A <{p}>exists in science fiction only<{br/}><{/p}>
B <{p}>is yet to come and it will solve some practical problems<{br/}><{/p}>
C <{p}>will not be accepted by the masses<{br/}><{/p}>
D <{p}>will be accepted by all without any challenge.<{br/}><{/p}>
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