Answer:
first option
Step-by-step explanation:
given
A = [tex]\left[\begin{array}{ccc}3&4\\6&-2\\1&0\end{array}\right][/tex]
To obtain 3A multiply each of the elements in A by 3
3A = [tex]\left[\begin{array}{ccc}3(3)&4(3)\\6(3)&-2(3)\\1(3)&0(3)\end{array}\right][/tex] = [tex]\left[\begin{array}{ccc}9&12\\18&-6\\3&0\end{array}\right][/tex]