Question

I know my answer on this question but I don't understand how it got that number. It is probably simple and I am overworking it. Can some one explain to me? I show the answer to be $50,000. Thad Joslin was judged at fault in an automobile accident. Three others were awarded damages of $150,000, $75,000, and $75,000. Thad has 100/300 bodily injury liability coverage. What amount, if any, would not be covered by his insurance? A. $150,000 B. $100,000 C. $50,000 D. None. The total amount would be covered by insurance