On 1 January 2004, the value of an investor’s portfolio is $ 89000. The investor plans to donate $ 4000 to charity organization and pay $ 2000 to his insurance account on 31 December of 2004, but meanwhile he does not want the year-end portfolio value to be below $ 89000. If the expected return on the existing portfolio is 12 percent with a variance of 125, the safety-first ratio that would be used to evaluate the portfolio based on Roy’ s criterion is closest to:（）
A. 0.236.
B. 0.365.
C. 0.471.