【单选题】
A hadoop jar hadoop-mapreduce-examples-2.7.3.jar wordcount /hello /out
B hadoop hadoop-mapreduce-examples-2.7.3.jar wordcount /hello
C hadoop hadoop-mapreduce-examples-2.7.3.jar wordcount /hello /out
D hadoop jar hadoop-mapreduce-examples-2.7.3.jar wordcount /hello /home
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