Subject math GRE exam 0568 Q.46

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This is the question with its answer:enter image description here

It is not clear for me why we should show the first statement in the following picture:enter image description here

Could anyone explain this for me please?

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Since $i$ generates the group then $z=i^m$ for some $m$. Now, if $i$ maps to $i^k$ then $z$ maps to $i^{mk}=z^k$ following the homomorphism properties.