Of the roughly 10,000 cases that are appealed to it, the California State Supreme Court tends to issue written opinions for _________ of the cases during an annual term.
The best answer to this question is Option A, which says that the Supreme Court issues written opinions in about 100 of the roughly 10,000 cases that are appealed to it each year. This means that the Supreme Court is only actually issuing written opinions on a tiny fraction of the cases it is asked to hear.
In the link below, we can find an annual report for the state court system of California. At the end of the first page of the Preface, we see a brief summary of Supreme Court statistics for the fiscal year 2013-14. In that year, there were 7,907 filings. This is considerably less than the 10,000 mentioned in your question, but it is in the same ballpark. The Supreme Court only handed down 85 written opinions. Of the options in your question, A is clearly the closest to this figure. Therefore, A is the best answer.