Bruce is a talented writer and graphic artist who enjoys both types of work equally. Instead of earning 45,000 dollars as a writer, Bruce now earns 25,000 dollars in accounting profits as a graphic artist using the same computer equipment he would have used as a writer. What is Bruce\textquotesingle s economic profit from choosing to work as a graphic artist? 
选项为:A:-45,000 dollars  B:-20,000 dollars  C:20,000 dollars  D:45,000 dollars  E:70,000 dollars  请回答其中一个选项.