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With regard to the use of industry sector as a basis of diversification for an investment portfolio, which one of the following statements is true? A) Portfolio diversification is always enhanced when securities from only a single industry are included in the portfolio. B) The selection of industries subject to independent sources of risk can aid in portfolio diversification. C) The selection of securities from two similar industries with perfect correlation will maximize the benefit of portfolio diversification. D) Industry is not a basis upon which portfolio diversification should be based