Answer: B. Loss of earnings from employment
Explanation:
The opportunity cost of choosing a course of action is the returns that you would have earned from choosing the next best action.
David was employed and yet decided to quit that job and start a business. The next best thing he could have been doing was working which means that the opportunity cost was the returns from working which was his salary.
In deciding to open up his own businesses, he had to forego the opportunity costs which meant that he lost the earnings from that his employment.
