问题：
[单选题]国家采取有利于( )的经济、技术政策和措施,鼓励和支持使用低硫分、 低灰分的优质煤炭,鼓励和支持洁净煤技术的开发和推广。 (2.0)
A、优质煤利用
B、煤炭清洁利用
C、脱硫、脱硝技术的利用
D、统一解决热源
参考答案：
B
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