Answer:B. Diversification can reduce risk but not eliminate it.
C. Returns on stocks in the same industry are more closely correlated than on stocks in different industries.
Step-by-step explanation: Portfolio is a combination of financial assets,like commodities,real estate,stocks,bonds,cash, currencies,Arts,private investments etc owned by a business entity or an individual.
Portfolio diversification as explained by the theory of Markowitz Harry an Economist he STATED THAT IF THE RETURNS ON AN INVESTMENT IS CONSTANT, INVESTORS WILL DIVERSIFY INTO LOW RISK INVESTMENTS. THE RETURNS ON INVESTMENT EXPECTED FROM FIRMS WITH SIMILAR PRODUCT WILL LIKELY BE THE SAME.