She looked at the beautiful scarf and wondered           .

A．how much does it cost

B．how much it costs

C．how much did it cost

D．how much it cost

企业年金是企业及其职工在依法参加基本养老保险的基础上，自愿建立的补充养老保险制度，是我国城镇职工养老保险体系的“（）”。