19.Which of the following statements is most correct?

A. An inefficient portfolio maximizes return for a given level of risk, or minimizes risk for a given level of return.

B. A single asset is called a portfolio

C. The goal of an inefficient portfolio is to minimize risk for a given level of return.

D. Combining negatively correlated assets having the same expected return results in a portfolio with the same level of expected return and a lower level of risk.