Thus the merchandising of the entire shopping center is important，but once inside， the individual stores must also be merchandised . From this sentence we may learn D

A、 The sales-volume（营业额）by the entire center is more important
B、 The sales-volume by the individual stores is in fact more important
C、 All the clerks are merchants whether they work for the entire center and for the individual stores
D、 Merchandising is the No. one affairs for both the entire center and for the individual stores