The author believes that __________ .A.library resources should be used frequently and com

The author believes that __________ .

A.library resources should be used frequently and completely

B.library resources cannot be made good use of if they are not available to us

C.one is supposed to be aware of the library resources that are usually not available

D.one is supposed to have good knowledge and make good use of resources

请帮忙给出正确答案和分析，谢谢！