Answer :
Given:
[tex]-3i[/tex]Required:
To find the magnitude of a given number.
Explanation:
Consider
[tex]0-3i[/tex]The magnitude is
[tex]\begin{gathered} =\sqrt{0^2+(-3)^2} \\ \\ =\sqrt{9} \\ \\ =3 \end{gathered}[/tex]Final Answer:
The option D is correct.
[tex]3[/tex]