The Conclusion says : '' museums are burdened by the gifts ''
B says '' people who gift also gift cash''
E : the potential xhibit is so necessary that sometimes the museums need to purchase''
B partly helps us feel that although the gifts burden the museum the cash MIGHT lessen the burden...this goes half-way in beating the conclusion for who knows if THE gifted cash is enough to make up for the financial problem
whereas E goes on to say that the ''gifts'' are so important that they NEED TO be bought with their own ( museum's) money if necessary...
this shows that the ''gifts'' are not exactly a financial burden...
hope that helps !
the whole worldmakes way for the man who knows wer he's going... good luck