To find the cubic root of 189, we denote it as \( \sqrt[3]{189} \).
To simplify \( \sqrt[3]{189} \), we should factor 189:
\[ 189 = 3^3 \times 7 \]
Now, taking the cubic root:
\[ \sqrt[3]{189} = \sqrt[3]{3^3 \times 7} = \sqrt[3]{3^3} \times \sqrt[3]{7} = 3 \cdot \sqrt[3]{7} \]
Thus, the cubic root of 189 is:
\[ 3 \sqrt[3]{7} \]
Among the options provided, it seems that the closest matching response is:
3 root index 3 start root 7 end root, which represents \( 3\sqrt[3]{7} \).