Improvement in the corporate sector's performance reflects the growth in profits by corporations from their main line of business as a result of a rise in retail prices due to increasing exports and domestic demand.

Improvement in the corporate sector's performance reflects the growth in profits by corporations from their main line of business as a result of a rise in retail prices due to increasing exports and domestic demand.

A.企业部门业绩的改善反映出，由于出口和国内需求的增加，零售价格上升，企业从其主要业务领域获得的利润增长。

B.企业表现的进展反映了主要事业部门的获利，这是外销及内销的需求提升而导致的。

C.由于外销及内销的需求提升，造成零售价格提高，企业的业绩改善反映了主要事业部门的获利。

D.公司部门的业绩是否提高，要看公司因出口和内需的增加所导致零售价格升高而从主要营业项目中所获利润是否有所增长。

正确答案是D