In the Following Proof, Which Justification Is Correct for Line

Multiple Choice

In the following proof, which justification is correct for line 4? $\begin{array}{llcc} \text {(1) }(\exists y) \mathrm{Myyy } & \text {\(/(\exists x) (\exists y) (\exists z) \mathrm{M} x y z\) } &\text { Fremise/Conclusion }\\ \text { (2) Maaa } &&1 \mathrm{EI}\\ \text { (3) ( } \exists z \text { ) Maaz } &&2 \mathrm{EG}\\\text { (4) }(\exists y) (\exists z) \mathrm{Mayz} &\\\end{array}$

A) 2 EG
B) 3 QN
C) 3 EG
D) 3 Add
E) None of these answers are correct.