Find the Critical Value and Rejection Region for the Type $\alpha .$

Multiple Choice

Find the critical value and rejection region for the type of z-test with level of significance α $\alpha .$ Left-tailed test, α $\alpha = 0.05$

A) $z _ { 0 } = - 1.645 ; z < - 1.645$
B) $z _ { 0 } = - 2.33 ; z < - 2.33$
C) $\mathrm { z } _ { 0 } = - 2.575 ; \mathrm { z } < - 2.575$
D) $z _ { 0 } = - 1.96 ; z < - 1.96$