Answer: A) Net Interest Margin.
Step-by-step explanation:
JPMorgan Chase as a financial company would not deal with actual inventory so the Days sales outstanding is not a relevant measure. Neither is the SSS as the company is not a retail chain.
The relevant metric would be the Net Interest Margin which is used to measure the difference between the interest income that a bank or similar financial institution makes vs the interest payments that the company will pay out to its lenders.