Multiply the following and simplify.
$\left(13i\right)\left(17i\right)$

• A. $221$
• B. $221i$
• C. $-221$
• D. $-221i$

Answer: (C)

Verified step by step guidance

1. Identify the expression to multiply: \(\left(13i\right)\left(17i\right)\), where \(i\) is the imaginary unit with the property \(i^2 = -1\).
2. Multiply the numerical coefficients: \(13 \times 17 = 221\).
3. Multiply the imaginary units: \(i \times i = i^2\).
4. Substitute \(i^2\) with \(-1\) to simplify the expression: \(221 \times i^2 = 221 \times (-1)\).
5. Combine the results to write the simplified product: \(-221\).