问题
根据矩阵数乘的运算规律，$\lambda$ $($ $\boldsymbol{A}$ $+$ $\boldsymbol{B}$ $)$ $=$ $?$选项
[A]. $\lambda$ $($ $\boldsymbol{A}$ $+$ $\boldsymbol{B}$ $)$ $=$ $\lambda$ $\boldsymbol{A}$ $\times$ $\lambda$ $\boldsymbol{B}$[B]. $\lambda$ $($ $\boldsymbol{A}$ $+$ $\boldsymbol{B}$ $)$ $=$ $\lambda$ $\boldsymbol{A}$ $+$ $\lambda$ $\boldsymbol{B}$
[C]. $\lambda$ $($ $\boldsymbol{A}$ $+$ $\boldsymbol{B}$ $)$ $=$ $\lambda^{2}$ $\boldsymbol{A}$ $+$ $\lambda^{2}$ $\boldsymbol{B}$
[D]. $\lambda$ $($ $\boldsymbol{A}$ $+$ $\boldsymbol{B}$ $)$ $=$ $\lambda$ $\boldsymbol{A}$ $-$ $\lambda$ $\boldsymbol{B}$
$\textcolor{orange}{\lambda}$ $($ $\boldsymbol{A}$ $+$ $\boldsymbol{B}$ $)$ $=$ $\textcolor{orange}{\lambda}$ $\boldsymbol{A}$ $+$ $\textcolor{orange}{\lambda}$ $\boldsymbol{B}$