Answer: B) stock trader
Explanations: A stock trader can be simply defined as an individual representing themself or organization/firms in trading equity securities i.e buying and selling stocks. They are also called equity or share traders. Their main objective is to take advantage of the fluctuations of individuals stocks and make as much profit from it in the market by acting as either an agent, arbitrageur, speculator, stockbroker, hedger.
So a stock trader is the occupation that organize the buying and selling of security on someone else behalf.