question_answer

If \[A=\left[ \begin{matrix}    2 & 4 & 5  \\    4 & 8 & 10  \\    -6 & -12 & -15  \\ \end{matrix} \right],\]  then rank of A is equal to

A)  0                                

B)  1

C)  2                                

D)  3

E)  None of these