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 is incorrect about the risk of an equity security? The risk of an equity security is:
Option A:based on the uncertainty of its cash flows.
Option B:based on the uncertainty of its future price.
Option C:measured using the standard deviation of its dividends.

Answer: C