Answer:
D) 18
Explanation:
Hello,
In this case, by considering the given rate law:
[tex]r=k[A]^2[B][/tex]
We also take into account that the concentration of A is tripled and the concentration of B is doubled, therefore, we have:
[tex]r=k[3*A]^2[2*B][/tex]
Which results in an increasing factor of:
[tex]3^2*2=9*2=18[/tex]
By considering only the tripling and the doubling, thus, the answer is D) 18.
Regards.
