Given a text T, and several options, according to the question posed in the text T to choose the most appropriate option from the options as the answer, please directly output the most appropriate option, do not need to output the explanation.

Which of the following events is most likely an example of nonsystematic risk?
Option A:A decline in interest rates.
Option B:The resignation of chief executive officer.
Option C:An increase in the value of the US dollar.

Answer: B