Final answer:
The correct way to transform the sentence 'I am not a king' using 'I wish' is 'A. I wish I were a king', as it properly uses the subjunctive mood for hypothetical situations.
Step-by-step explanation:
In English, when expressing a wish or a hypothetical situation that is not true, we use the subjunctive mood. The correct transformation of the sentence "I am not a king" using "I wish" would be A. I wish I were a king. This is because "were" is used in the subjunctive mood to talk about imaginary or hypothetical situations, regardless of the number or person of the subject.