A fourth market transaction occurs when:（）

A. a security is purchased by a dealer and then immediately resold.

B. exchange-listed shares are traded in the OTC market.

C. a buyer and seller complete a trade without the assistance of an intermediary broker.

透明物质的颜色是（）光的颜色。

A、反射

B、透过

C、吸收

D、漫反射