【名词&注释】
线性规划模型(linear programming model)、必备条件(essential condition)
[单选题]下列向量中的概率向量是()
A. (0.1,0.4,0,0.5) B. (0.1,0.4,0.1,0.5) C. (0.6,0.4,0,0.5) D. (0.6,0.1,0.8,-0.5)