I got C:
z^n= 1 and we need to find z.
if n is 0, z can be anything as anything^0= 1. If n is not 0, then z can be 1 or -1.
1. n is a non-zero integer.
So if n=2 (or any even postive integer)then z=1 or -1. Insufficient
2. z is greater than 0.
By itself, that doesn't tell us much. z could be anything if n=0 and we're not told anything about n. Insufficient.
1&2: from 1) z= 1 or -1. 2) z=+ Thus, z=1 Sufficent.
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