The best answer to this question is Option A, which says that 10% of all cases that are filed actually make it to trial. For this to be right, we must be talking about civil cases rather than about criminal cases. In criminal cases, the percentage of cases going to trial is much lower.
According to statistics given in the link below, much fewer than 10% of criminal cases in the state of California go to trial. As the link says, “about 2.2 percent of felony cases go to a jury trial…” This is, of course, much lower than 10%. However, many more civil cases actually do go to trial. As we can see in this link, the average for California is about 10%.
In general, people do not like to bring their cases to trial. Going to trial is expensive and it is never clear who is going to win. Most parties to cases prefer to negotiate a settlement rather than going to the expense and the uncertainty of a trial.