光合作用过程是一个 [ ]

A．合成有机物，贮存能量的过程　　

B．分解有机物，贮存能量的过程

C．合成有机物，释放能量的过程　　

D．分解有机物，释放能量的过程

An analyst does research about efficient frontier. Which statement is the least likely the character of the efficient frontier（）

A. Minimize risk for a given return target.

B. Slope decrease along the curve.

C. Have the same utility for investors.