Your portfolio invests in the stock of two companies. Company​ A’s stock has a variance of​ 0.25, while Company​ B’s stock has a standard deviation of 0.30. The correlation between the two stocks is 0.40. If​ 30% of your portfolio is invested in Company​ A, and​ 70% in Company​ B, what is the standard deviation of your​ portfolio?   A. ​28.74%   B. ​24.96%   C. ​30.30%   D. ​28.50%

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