Which one of the following is a scalar matrix?

Question:

Which one of the following is a scalar matrix?

A. $\left(\begin{array}{ll}1 & 1 \\ 1 & 1\end{array}\right)$

B. $\left(\begin{array}{ll}6 & 0 \\ 0 & 3\end{array}\right)$

c. $\left(\begin{array}{cc}-8 & 0 \\ 0 & -8\end{array}\right)$

D. None of these

Solution:

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