Charlie and Lucinda Each Have $50,000 Invested in Stock Portfolios

Charlie and Lucinda each have $50,000 invested in stock portfolios.Charlie's has a beta of 1.2, an expected return of 10.8%, and a standard deviation of 25%.Lucinda's has a beta of 0.8, an expected return of 9.2%, and a standard deviation that is also 25%.The correlation coefficient, r, between Charlie's and Lucinda's portfolios is zero.If Charlie and Lucinda marry and combine their portfolios, which of the following best describes their combined $100,000 portfolio?

A) The combined portfolio's beta will be equal to a simple weighted average of the betas of the two individual portfolios, 1.0; its expected return will be equal to a simple weighted average of the expected returns of the two individual portfolios, 10.0%; and its standard deviation will be less than the simple average of the two portfolios' standard deviations, 25%.
B) The combined portfolio's expected return will be greater than the simple weighted average of the expected returns of the two individual portfolios, 10.0%.
C) The combined portfolio's standard deviation will be greater than the simple average of the two portfolios' standard deviations, 25%.
D) The combined portfolio's standard deviation will be equal to a simple average of the two portfolios' standard deviations, 25%.
E) The combined portfolio's expected return will be less than the simple weighted average of the expected returns of the two individual portfolios, 10.0%.