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 statements is most accurate? If the covariance of returns between two assets is 0.0023, then:
Option A:the assets’ risk is near zero.
Option B:the asset returns are unrelated.
Option C:the asset returns have a positive relationship.

Answer: C