My understanding it would be letter ( i ) because it is imaginary.
I'll do the math for this, it may take me a few minutes so i will update this comment with an answer in just a minute. I always get anxious when nobody replies kind of quickly as i feel it is being forgotten. So just a heads up i'm working on a answer!
Answer: 
<u>Simplify both sides of the equation.</u>
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<u></u>
<u></u>
<u>Add 4x to both sides</u>
<u></u>
<u></u>
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<u>Subtract 8 from both sides</u>
<u></u>
<u>Divide both sides by -3</u>
<u></u>
<u></u>
Answer:
Answer D
Step-by-step explanation: