Doyle makes good use of many literary devices in his detective novel to ____ an impression of tension and mystery.

A．advocate

B．convey

C．describe

D．attract

证券公司通过客户信用交易担保证券账户持有的股票虽然不计入其自由股票，但是证券公司也需履行相应的信息报告、披露或者要约收购义务。( )