Why do we find it difficult to remember all the details in books when we read them?

A、Becausepeopledon'tdotheirbesttoremember.;
B、Becausepeopledonothavemanycognitiveresourceswhendoinginformationprocessing.;
C、Becausethecontentofthisbookistooboring.;
D、Becausepeoplehaveapoormemory.